MTConnectDevices_1.7_1.0.xsd

<?xml version='1.0' encoding='UTF-8'?>
<!--
Copyright (c) 2008-2019, AMT – The Association For Manufacturing Technology (“AMT”)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the AMT nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

DISCLAIMER OF WARRANTY. ALL MTCONNECT MATERIALS AND SPECIFICATIONS PROVIDED
BY AMT, MTCONNECT OR ANY PARTICIPANT TO YOU OR ANY PARTY ARE PROVIDED "AS IS"
AND WITHOUT ANY WARRANTY OF ANY KIND. AMT, MTCONNECT, AND EACH OF THEIR
RESPECTIVE MEMBERS, OFFICERS, DIRECTORS, AFFILIATES, SPONSORS, AND AGENTS
(COLLECTIVELY, THE "AMT PARTIES") AND PARTICIPANTS MAKE NO REPRESENTATION OR
WARRANTY OF ANY KIND WHATSOEVER RELATING TO THESE MATERIALS, INCLUDING, WITHOUT
LIMITATION, ANY EXPRESS OR IMPLIED WARRANTY OF NONINFRINGEMENT,
MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. 

LIMITATION OF LIABILITY. IN NO EVENT SHALL AMT, MTCONNECT, ANY OTHER AMT
PARTY, OR ANY PARTICIPANT BE LIABLE FOR THE COST OF PROCURING SUBSTITUTE GOODS
OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA OR ANY INCIDENTAL,
CONSEQUENTIAL, INDIRECT, SPECIAL OR PUNITIVE DAMAGES OR OTHER DIRECT DAMAGES,
WHETHER UNDER CONTRACT, TORT, WARRANTY OR OTHERWISE, ARISING IN ANY WAY OUT OF
THIS AGREEMENT, USE OR INABILITY TO USE MTCONNECT MATERIALS, WHETHER OR NOT
SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
-->
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns='urn:mtconnect.org:MTConnectDevices:1.7' xmlns:mt='urn:mtconnect.org:MTConnectDevices:1.7' targetNamespace='urn:mtconnect.org:MTConnectDevices:1.7' elementFormDefault='qualified' attributeFormDefault='unqualified' xmlns:xlink='http://www.w3.org/1999/xlink'>
  <xs:import namespace='http://www.w3.org/1999/xlink' schemaLocation='xlink.xsd'/>
  <xs:element name='MTConnectDevices' type='MTConnectDevicesType'>
    <xs:annotation>
      <xs:documentation>
        The root node for MTConnect
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SenderType'>
    <xs:annotation>
      <xs:documentation>
        The sender of the message
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='CreationTimeType'>
    <xs:annotation>
      <xs:documentation>
        The date and time the document was created
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='SequenceType'>
    <xs:annotation>
      <xs:documentation>
        A sequence number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='18446744073709551615'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='TestIndicatorType'>
    <xs:annotation>
      <xs:documentation>
        A debugging flag for testing.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:simpleType name='InstanceIdType'>
    <xs:annotation>
      <xs:documentation>
        The instance number of the agent, used for fault tolerance
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='18446744073709551615'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='BufferSizeType'>
    <xs:annotation>
      <xs:documentation>
        The size of the agents buffer
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='TimestampType'>
    <xs:annotation>
      <xs:documentation>
        The time the sample was reported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='OccurrenceTimeType'>
    <xs:annotation>
      <xs:documentation>
        The time a sample occurred
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='VersionType'>
    <xs:annotation>
      <xs:documentation>
        A version number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='NameType'>
    <xs:annotation>
      <xs:documentation>
        A short name for any element
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='UuidType'>
    <xs:annotation>
      <xs:documentation>
        A universally unique id that uniquely identifies the element for
        it&apos;s entire life
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='SerialNumberAttrType'>
    <xs:annotation>
      <xs:documentation>
        A serial number for a piece of equipment
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='ItemSourceType'>
    <xs:annotation>
      <xs:documentation>
        The measurement source
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='RateType'>
    <xs:annotation>
      <xs:documentation>
        A sample rate in milliseconds per sample
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='ComponentIdType'>
    <xs:annotation>
      <xs:documentation>
        The id of the component (maps to the id from probe)
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:ID'/>
  </xs:simpleType>
  <xs:simpleType name='IDType'>
    <xs:annotation>
      <xs:documentation>
        An identifier
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:ID'/>
  </xs:simpleType>
  <xs:simpleType name='SignificantDigitsValueType'>
    <xs:annotation>
      <xs:documentation>
        The number significant digits
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:simpleType name='CompositionIdType'>
    <xs:annotation>
      <xs:documentation>
        The item&apos;s reference to the Device model composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='DurationTimeType'>
    <xs:annotation>
      <xs:documentation>
        A length of time in seconds
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='RemovedType'>
    <xs:annotation>
      <xs:documentation>
        A flag indicating the item has been removed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:simpleType name='KeyType'>
    <xs:annotation>
      <xs:documentation>
        The key for adata set
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='DeviceModelChangeTimeType'>
    <xs:annotation>
      <xs:documentation>
        A timestamp in 8601 format of the last update of the Device information
        for any device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='AssetIdType'>
    <xs:annotation>
      <xs:documentation>
        The unique id of the asset
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='AssetAttrTypeType'>
    <xs:annotation>
      <xs:documentation>
        An asset type
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='AssetBufferSizeType'>
    <xs:annotation>
      <xs:documentation>
        The maximum number of assets
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='AssetCountAttrType'>
    <xs:annotation>
      <xs:documentation>
        The number of assets
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='0'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='FloatListValueType'>
    <xs:annotation>
      <xs:documentation>
        Common floating point sample value
      </xs:documentation>
    </xs:annotation>
    <xs:list>
      <xs:simpleType>
        <xs:restriction base='xs:float'/>
      </xs:simpleType>
    </xs:list>
  </xs:simpleType>
  <xs:simpleType name='ThreeSpaceValueType'>
    <xs:annotation>
      <xs:documentation>
        A three dimensional value &apos;X Y Z&apos; or &apos;A B C&apos;
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='FloatListValueType'>
      <xs:maxLength value='3'/>
      <xs:minLength value='3'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DescriptionTextType'>
    <xs:annotation>
      <xs:documentation>
        A description
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACCELERATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACCUMULATED_TIME'>
        <xs:annotation>
          <xs:documentation>
            The measurement of accumulated time for an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. Replaced by `AMPERAGE_AC` and
            `AMPERAGE_DC`. The measurement of electrical current.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGLE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of angular position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_ACCELERATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement rate of change of angular velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of angular position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_FEEDRATE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the feedrate of a linear axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAPACITY_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid capacity of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAPACITY_SPATIAL'>
        <xs:annotation>
          <xs:documentation>
            The geometric capacity of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOCK_TIME'>
        <xs:annotation>
          <xs:documentation>
            The value provided by a timing device at a specific point in time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONCENTRATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the percentage of one component within a mixture
            of components
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONDUCTIVITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the ability of a material to conduct electricity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUTTING_SPEED'>
        <xs:annotation>
          <xs:documentation>
            The speed difference (relative velocity) between the cutting
            mechanism and the surface of the workpiece it is operating on.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DENSITY'>
        <xs:annotation>
          <xs:documentation>
            The volumetric mass of a material per unit volume of that material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_ACCELERATION_VOLUMETRIC'>
        <xs:annotation>
          <xs:documentation>
            The rate of change in spatial volume of material deposited in an
            additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_DENSITY'>
        <xs:annotation>
          <xs:documentation>
            The density of the material deposited in an additive manufacturing
            process per unit of volume.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_MASS'>
        <xs:annotation>
          <xs:documentation>
            The mass of the material deposited in an additive manufacturing
            process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_RATE_VOLUMETRIC'>
        <xs:annotation>
          <xs:documentation>
            The rate at which a spatial volume of material is deposited in an
            additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_VOLUME'>
        <xs:annotation>
          <xs:documentation>
            The spatial volume of material to be deposited in an additive
            manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISPLACEMENT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the change in position of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ELECTRICAL_ENERGY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of electrical energy consumption by a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EQUIPMENT_TIMER'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of time a piece of equipment or a
            sub-part of a piece of equipment has performed specific activities.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FILL_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of a substance remaining compared to
            the planned maximum amount of that substance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FLOW'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of flow of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FREQUENCY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the number of occurrences of a repeating event
            per unit time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GLOBAL_POSITION'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in Version 1.1
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LENGTH'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the length of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LEVEL'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2*. See `FILL_LEVEL`. Represents the
            level of a resource.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR_FORCE'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Force)}} applied to a mass in one direction only.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOAD'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the actual versus the standard rating of a piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MASS'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the mass of an object(s) or an amount of
            material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the feedrate for the axes, or a single axis,
            associated with a {{block(Path)}} component-a vector.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE_PER_REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            The feedrate for the axes, or a single axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_POSITION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated position of a control point associated with
            a {{block(Controller)}} element, or {{block(Path)}} element if
            provided, of a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POSITION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated position of a {{block(Component)}} element
            as reported by a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_FACTOR'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the ratio of real power flowing to a load to the
            apparent power in that AC circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURE'>
        <xs:annotation>
          <xs:documentation>
            The force per unit area measured relative to atmospheric pressure.
            Commonly referred to as gauge pressure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_TIMER'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of time a piece of equipment has
            performed different types of activities associated with the process
            being performed at that piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RESISTANCE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the degree to which a substance opposes the
            passage of an electric current.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rotational speed of a rotary axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SOUND_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a sound level or sound pressure level relative to
            atmospheric pressure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPINDLE_SPEED'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2*. Replaced by `ROTARY_VELOCITY`. The
            rotational speed of the rotary axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STRAIN'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of deformation per unit length of an
            object when a load is applied.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TEMPERATURE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TENSION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a force that stretches or elongates an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TILT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of angular displacement.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TORQUE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the turning force exerted on an object or by an
            object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of position of a
            {{block(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VISCOSITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a fluids resistance to flow.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. Replaced by `VOLTAGE_AC` and
            `VOLTAGE_DC`. The measurement of electrical potential between two
            points.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLUME_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid volume of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLUME_SPATIAL'>
        <xs:annotation>
          <xs:documentation>
            The geometric volume of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATTAGE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of power flowing through or dissipated by an
            electrical circuit or piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE_AC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of an electrical current that reverses direction at
            regular short intervals.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE_DC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of an electric current flowing in one direction
            only.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE_AC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the electrical potential between two points in an
            electrical circuit in which the current periodically reverses
            direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE_DC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the electrical potential between two points in an
            electrical circuit in which the current is unidirectional.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='X_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the X direction of the
            referenced coordinate system. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='Y_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the Y direction of the
            referenced coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='Z_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the Z direction of the
            referenced coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIAMETER'>
        <xs:annotation>
          <xs:documentation>
            The measured dimension of a diameter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ORIENTATION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated orientation of a plane or vector relative
            to a cartesian coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_RELATIVE'>
        <xs:annotation>
          <xs:documentation>
            The amount of water vapor present expressed as a percent to reach
            saturation at the same temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            The amount of water vapor expressed in grams per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_SPECIFIC'>
        <xs:annotation>
          <xs:documentation>
            The ratio of the water vapor present over the total weight of the
            water vapor and air present expressed as a percent.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBSERVATION_UPDATE_RATE'>
        <xs:annotation>
          <xs:documentation>
            The average rate of change of values for data items in the MTConnect
            streams. The average is computed over a rolling window defined by
            the implementation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_UPDATE_RATE'>
        <xs:annotation>
          <xs:documentation>
            The average rate of change of values for assets in the MTConnect
            streams. The average is computed over a rolling window defined by
            the implementation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURIZATION_RATE'>
        <xs:annotation>
          <xs:documentation>
            The change of pressure per unit time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECELERATION'>
        <xs:annotation>
          <xs:documentation>
            Negative rate of change of velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_DECELERATION'>
        <xs:annotation>
          <xs:documentation>
            Negative rate of change of angular velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURE_ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            The force per unit area measured relative to a vacuum.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE_AXES'>
        <xs:annotation>
          <xs:documentation>
            The set of axes currently associated with a {{block(Path)}} or
            {{block(Controller)}} {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUATOR_STATE'>
        <xs:annotation>
          <xs:documentation>
            Represents the operational state of an apparatus for moving or
            controlling a mechanism or system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALARM'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED:** Replaced with {{block(CONDITION)}} category data
            items in Version 1.1.0.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_CHANGED'>
        <xs:annotation>
          <xs:documentation>
            The {{block(assetId)}} of the asset that has been added or changed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_REMOVED'>
        <xs:annotation>
          <xs:documentation>
            The {{block(assetId)}} of the asset that has been removed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AVAILABILITY'>
        <xs:annotation>
          <xs:documentation>
            Represents the {{term(Agent)}}&apos;s ability to communicate with
            the data source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_COUPLING'>
        <xs:annotation>
          <xs:documentation>
            Describes the way the axes will be associated to each other. This is
            used in conjunction with {{block(COUPLED_AXES)}} to indicate the way
            they are interacting.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_FEEDRATE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation issued to adjust the feedrate
            of an individual linear type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indicator of the state of the axis lockout function when power
            has been removed and the axis is allowed to move freely.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indicator of the controlled state of a {{block(Linear)}} or
            {{block(Rotary)}} component representing an axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BLOCK'>
        <xs:annotation>
          <xs:documentation>
            The line of code or command being executed by a
            {{block(Controller)}} {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BLOCK_COUNT'>
        <xs:annotation>
          <xs:documentation>
            The total count of the number of blocks of program code that have
            been executed since execution started.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operational condition of the interlock function
            for an electronically controller chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating state of a mechanism that holds a
            part or stock material during a manufacturing process. It may also
            represent a mechanism that holds any other mechanism in place within
            a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSE_CHUCK'>
        <xs:annotation>
          <xs:documentation>
            Service to close a chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSE_DOOR'>
        <xs:annotation>
          <xs:documentation>
            Service to close a door.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CODE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.1*. The programmatic code being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPOSITION_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating condition of a mechanism represented
            by a {{block(Composition)}} type element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROLLER_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode of the {{block(Controller)}} component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROLLER_MODE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of a piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUPLED_AXES'>
        <xs:annotation>
          <xs:documentation>
            Refers to the set of associated axes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATE_CODE'>
        <xs:annotation>
          <xs:documentation>
            The time and date code associated with a material or other physical
            item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_UUID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of another piece of equipment that is temporarily
            associated with a component of this piece of equipment to perform a
            particular function.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIRECTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with the direction of motion of
            a {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DOOR_STATE'>
        <xs:annotation>
          <xs:documentation>
            The operational state of a {{block(Door)}} component or composition
            element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EMERGENCY_STOP'>
        <xs:annotation>
          <xs:documentation>
            The current state of the emergency stop signal for a piece of
            equipment, controller path, or any other component or subsystem of a
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='END_OF_BAR'>
        <xs:annotation>
          <xs:documentation>
            An indication that the end of a piece of bar stock has been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EQUIPMENT_MODE'>
        <xs:annotation>
          <xs:documentation>
            An indication that a piece of equipment, or a sub-part of a piece of
            equipment, is performing specific types of activities.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXECUTION'>
        <xs:annotation>
          <xs:documentation>
            The execution status of the {{block(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FUNCTIONAL_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current intended production status of the device or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HARDNESS'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the hardness of a material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INTERFACE_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operation condition of an {{block(Interface)}}
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.4.0*. The current line of code being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE_LABEL'>
        <xs:annotation>
          <xs:documentation>
            An optional identifier for a {{block(Block)}} of code in a
            {{block(Program)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A reference to the position of a block of program code within a
            control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL'>
        <xs:annotation>
          <xs:documentation>
            The identifier of a material used or consumed in the manufacturing
            process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_CHANGE'>
        <xs:annotation>
          <xs:documentation>
            Service to change the type of material or product being loaded or
            fed to a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_FEED'>
        <xs:annotation>
          <xs:documentation>
            Service to advance material or feed product to a piece of equipment
            from a continuous or bulk source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_LAYER'>
        <xs:annotation>
          <xs:documentation>
            Identifies the layers of material applied to a part or product as
            part of an additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_LOAD'>
        <xs:annotation>
          <xs:documentation>
            Service to load a piece of material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_RETRACT'>
        <xs:annotation>
          <xs:documentation>
            Service to remove or retract material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            Service to unload a piece of material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MESSAGE'>
        <xs:annotation>
          <xs:documentation>
            Any text string of information to be transferred from a piece of
            equipment to a client software application.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPEN_CHUCK'>
        <xs:annotation>
          <xs:documentation>
            Service to open a chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPEN_DOOR'>
        <xs:annotation>
          <xs:documentation>
            Service to open a door.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATOR_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of the person currently responsible for operating the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PALLET_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier for a pallet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_CHANGE'>
        <xs:annotation>
          <xs:documentation>
            Service to change the part or product associated with a piece of
            equipment to a different part or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_COUNT'>
        <xs:annotation>
          <xs:documentation>
            The aggregate count of parts.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_DETECT'>
        <xs:annotation>
          <xs:documentation>
            An indication designating whether a part or work piece has been
            detected or is present.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_ID'>
        <xs:annotation>
          <xs:documentation>
            An identifier of a part in a manufacturing operation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.7*. `PART_NUMBER` is now a `subType` of
            `PART_KIND_ID`. An identifier of a part or product moving through
            the manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation issued to adjust the feedrate
            for the axes associated with a {{block(Path)}} component that may
            represent a single axis or the coordinated movement of multiple
            axes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_MODE'>
        <xs:annotation>
          <xs:documentation>
            Describes the operational relationship between a {{block(Path)}}
            {{term(Structural Element)}} and another {{block(Path)}}
            {{term(Structural Element)}} for pieces of equipment comprised of
            multiple logical groupings of controlled axes or other logical
            operations.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_STATE'>
        <xs:annotation>
          <xs:documentation>
            The indication of the status of the source of energy for a
            {{term(Structural Element)}} to allow it to perform its intended
            function or the state of an enabling signal providing permission for
            the {{term(Structural Element)}} to perform its functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_STATUS'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.1.0*. The `ON` or `OFF` status of the
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_TIME'>
        <xs:annotation>
          <xs:documentation>
            The time and date associated with an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            The name of the logic or motion program being executed by the
            {{block(Controller)}} component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_COMMENT'>
        <xs:annotation>
          <xs:documentation>
            A comment or non-executable statement in the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_EDIT'>
        <xs:annotation>
          <xs:documentation>
            An indication of the status of the {{block(Controller)}} components
            program editing mode. A program may be edited while another is
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_EDIT_NAME'>
        <xs:annotation>
          <xs:documentation>
            The name of the program being edited. This is used in conjunction
            with {{block(ProgramEdit)}} when in `ACTIVE` state. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_HEADER'>
        <xs:annotation>
          <xs:documentation>
            The non-executable header section of the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_LOCATION'>
        <xs:annotation>
          <xs:documentation>
            The Uniform Resource Identifier (URI) for the source file associated
            with {{block(Program)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_LOCATION_TYPE'>
        <xs:annotation>
          <xs:documentation>
            Defines whether the logic or motion program defined by
            {{block(Program)}} is being executed from the local memory of the
            controller or from an outside source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_NEST_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the nesting level within a control program that is
            associated with the code or instructions that is currently being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode for a {{block(Rotary)}} type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_VELOCITY_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The percentage change to the velocity of the programmed velocity for
            a {{block(Rotary)}} type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SERIAL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The serial number associated with a {{block(Component)}},
            {{block(Asset)}}, or {{block(Device)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPINDLE_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indication of the status of the spindle for a piece of equipment
            when power has been removed and it is free to rotate.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_ASSET_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of an individual tool asset.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_GROUP'>
        <xs:annotation>
          <xs:documentation>
            An identifier for the tool group associated with a specific tool.
            Commonly used to designate spare tools.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_ID'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2.0*. See `TOOL_ASSET_ID`. The
            identifier of the tool currently in use for a given `Path`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The identifier assigned by the {{block(Controller)}} component to a
            cutting tool when in use by a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_OFFSET'>
        <xs:annotation>
          <xs:documentation>
            A reference to the tool offset variables applied to the active
            cutting tool associated with a {{block(Path)}} in a
            {{block(Controller)}} type component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USER'>
        <xs:annotation>
          <xs:documentation>
            The identifier of the person currently responsible for operating the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VARIABLE'>
        <xs:annotation>
          <xs:documentation>
            A data value whose meaning may change over time due to changes in
            the opertion of a piece of equipment or the process being executed
            on that piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WAIT_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the reason that {{block(Execution)}} is reporting a
            value of `WAIT`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WIRE'>
        <xs:annotation>
          <xs:documentation>
            A string like piece or filament of relatively rigid or flexible
            material provided in a variety of diameters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORKHOLDING_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier for the current workholding or part clamp in use by a
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORK_OFFSET'>
        <xs:annotation>
          <xs:documentation>
            A reference to the offset variables for a work piece or part
            associated with a {{block(Path)}} in a {{block(Controller)}} type
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATING_SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            The Operating System of a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIRMWARE'>
        <xs:annotation>
          <xs:documentation>
            The embedded software of a component. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='APPLICATION'>
        <xs:annotation>
          <xs:documentation>
            The application on a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIBRARY'>
        <xs:annotation>
          <xs:documentation>
            The software library on a component
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HARDWARE'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with the hardware subsystem of
            the {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NETWORK'>
        <xs:annotation>
          <xs:documentation>
            Network details of a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTATION'>
        <xs:annotation>
          <xs:documentation>
            A three space angular rotation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSLATION'>
        <xs:annotation>
          <xs:documentation>
            A three space linear translation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_ADDED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of new device
            added to an {{term(MTConnect Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_REMOVED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of a device
            removed from an {{term(MTConnect Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_CHANGED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of the device
            whose {{term(Metadata)}} has changed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONNECTION_STATUS'>
        <xs:annotation>
          <xs:documentation>
            The status of the connection between an {{term(Adapter)}} and an
            {{term(Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ADAPTER_SOFTWARE_VERSION'>
        <xs:annotation>
          <xs:documentation>
            The originator’s software version of the {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ADAPTER_URI'>
        <xs:annotation>
          <xs:documentation>
            The {{term(URI)}} of the {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MTCONNECT_VERSION'>
        <xs:annotation>
          <xs:documentation>
            The reference version of the MTConnect Standard supported by the
            {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SENSOR_ATTACHMENT'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} defining an {{term(Attachment)}} between a
            sensor and an entity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_STATUS'>
        <xs:annotation>
          <xs:documentation>
            State or condition of a part.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_OCCURRENCE_ID'>
        <xs:annotation>
          <xs:documentation>
            An identifier of a process being executed by the device.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_AGGREGATE_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a group of
            related occurrences, such as a process step in a process plan.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_KIND_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a class of
            processes or process definition. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_GROUP_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to a collection of individual parts. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_KIND_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a class of
            parts, typically distinguished by a particular part design.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_UNIQUE_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to a distinguishable, individual part. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROL_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits used to indicate whether a process variable is
            stable and in control.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPECIFICATION_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits defining a range of values designating acceptable
            performance for a variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALARM_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits used to trigger warning or alarm indicators.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMMUNICATIONS'>
        <xs:annotation>
          <xs:documentation>
            An indication that the piece of equipment has experienced a
            communications failure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATA_RANGE'>
        <xs:annotation>
          <xs:documentation>
            An indication that the value of the data associated with a measured
            value or a calculation is outside of an expected range.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOGIC_PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            An indication that an error occurred in the logic program or
            programmable logic controller (PLC) associated with a piece of
            equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTION_PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            An indication that an error occurred in the motion program
            associated with a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            A general purpose indication associated with an electronic component
            of a piece of equipment or a controller that represents a fault that
            is not associated with the operator, program, or hardware.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUATOR'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with an actuator.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VARIABLE'>
        <xs:annotation>
          <xs:documentation>
            A user variable
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumType'>
    <xs:annotation>
      <xs:documentation>
        The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemEnumEnum DataItemEnumExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            Relating to or derived in the simplest manner from the fundamental
            units or measurements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating state of a mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUAL'>
        <xs:annotation>
          <xs:documentation>
            The measured value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALL'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALTERNATING'>
        <xs:annotation>
          <xs:documentation>
            The measurement of alternating voltage or current. If not specified
            further in statistic, defaults to RMS voltage. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='A_SCALE'>
        <xs:annotation>
          <xs:documentation>
            A Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AUXILIARY'>
        <xs:annotation>
          <xs:documentation>
            When multiple locations on a piece of bar stock being feed by a bar
            feeder are referenced as the indication of whether the end of that
            piece of bar stock has been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BAD'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced that do not conform to specification.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BRINELL'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='B_SCALE'>
        <xs:annotation>
          <xs:documentation>
            B Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMMANDED'>
        <xs:annotation>
          <xs:documentation>
            The commanded value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONSUMED'>
        <xs:annotation>
          <xs:documentation>
            The amount of material consumed from an object or container during a
            manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROL'>
        <xs:annotation>
          <xs:documentation>
            The state of the enabling signal or control logic that enables or
            disables the function or operation of the structural element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='C_SCALE'>
        <xs:annotation>
          <xs:documentation>
            C Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DELAY'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment or process waiting for an event or an action to
            occur.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIRECT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of DC current or voltage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DRY_RUN'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection used to execute a test mode to
            confirm the execution of machine functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='D_SCALE'>
        <xs:annotation>
          <xs:documentation>
            D Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPIRATION'>
        <xs:annotation>
          <xs:documentation>
            The time and date code relating to the expiration or end of useful
            life for a material or other physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIRST_USE'>
        <xs:annotation>
          <xs:documentation>
            The time and date code relating the first use of a material or other
            physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GOOD'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced that conform to specification.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCREMENTAL'>
        <xs:annotation>
          <xs:documentation>
            Relating to or derived from the last {{term(observation)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOG'>
        <xs:annotation>
          <xs:documentation>
            The feedrate specified by a logic or motion program when operating
            in a manual state or method (jogging).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LATERAL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the position of a mechanism that may move in a
            lateral direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LEEB'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the elasticity of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LENGTH'>
        <xs:annotation>
          <xs:documentation>
            A reference to a length type tool offset variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE'>
        <xs:annotation>
          <xs:documentation>
            The state of the power source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR'>
        <xs:annotation>
          <xs:documentation>
            The direction of motion of a linear motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOADED'>
        <xs:annotation>
          <xs:documentation>
            Subparts of a piece of equipment are under load.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MACHINE_AXIS_LOCK'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAIN'>
        <xs:annotation>
          <xs:documentation>
            Relating to the primary logic or motion program currently being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            Relating to maintenance on the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUAL_UNCLAMP'>
        <xs:annotation>
          <xs:documentation>
            An indication of the state of an operator controlled interlock that
            can inhibit the ability to initiate an unclamp action of an
            electronically controlled chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUFACTURE'>
        <xs:annotation>
          <xs:documentation>
            Related to the production of a material or other physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAXIMUM'>
        <xs:annotation>
          <xs:documentation>
            The maximum value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINIMUM'>
        <xs:annotation>
          <xs:documentation>
            The minimum value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOHS'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to scratching of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of the open or closed state of a mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NO_SCALE'>
        <xs:annotation>
          <xs:documentation>
            No weighting factor on the frequency scale.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATING'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment that is powered or performing any activity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATOR'>
        <xs:annotation>
          <xs:documentation>
            Relating to the person currently responsible for operating the piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPTIONAL_STOP'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The overridden value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWERED'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment is powered and functioning or
            {{termplural(Component)}} that are required to remain on are
            powered.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRIMARY'>
        <xs:annotation>
          <xs:documentation>
            The main or most important location **MUST** be designated as the
            end of a piece of bar stock.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROBE'>
        <xs:annotation>
          <xs:documentation>
            The value provided by a measurement probe.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS'>
        <xs:annotation>
          <xs:documentation>
            Relating to production of a part or product on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAMMED'>
        <xs:annotation>
          <xs:documentation>
            The programmed value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAL'>
        <xs:annotation>
          <xs:documentation>
            A reference to a radial type tool offset variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RAPID'>
        <xs:annotation>
          <xs:documentation>
            The feedrate specified by a logic or motion program when operating
            in a rapid positioning mode.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REMAINING'>
        <xs:annotation>
          <xs:documentation>
            The remaining measure of an object or an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROCKWELL'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY'>
        <xs:annotation>
          <xs:documentation>
            The direction of a rotary motion using the right hand rule
            convention.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SCHEDULE'>
        <xs:annotation>
          <xs:documentation>
            The identity of a control program that is used to specify the order
            of execution of other programs.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SET_UP'>
        <xs:annotation>
          <xs:documentation>
            Relating to the preparation of a piece of equipment for production
            or restoring the piece of equipment to a neutral state after
            production.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SHORE'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SINGLE_BLOCK'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STANDARD'>
        <xs:annotation>
          <xs:documentation>
            The standard measure of an object or an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='START'>
        <xs:annotation>
          <xs:documentation>
            Relating to the beginning of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SWITCHED'>
        <xs:annotation>
          <xs:documentation>
            An indication of the activation state of a mechanism represented by
            a {{term(Composition)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TARGET'>
        <xs:annotation>
          <xs:documentation>
            The targeted or desired value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TARGET_COMPLETION'>
        <xs:annotation>
          <xs:documentation>
            Relating to the end or completion of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_CHANGE_STOP'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USEABLE'>
        <xs:annotation>
          <xs:documentation>
            The remaining usable measure of an object or action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VERTICAL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the position of a mechanism that may move in a
            vertical direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VICKERS'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORKING'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment performing any activity, the equipment is
            active and performing a function under load or not.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IPV4_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            The IPV4 network address of the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IPV6_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            The IPV6 network address of the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GATEWAY'>
        <xs:annotation>
          <xs:documentation>
            The Gateway for the component network.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SUBNET_MASK'>
        <xs:annotation>
          <xs:documentation>
            The SubNet mask for the component network. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VLAN_ID'>
        <xs:annotation>
          <xs:documentation>
            The layer2 Virtual Local Network (VLAN) ID for the component
            network.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAC_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            Media Access Control Address. The unique physical address of the
            network hardware.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WIRELESS'>
        <xs:annotation>
          <xs:documentation>
            Identifies whether the connection type is wireless.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LICENSE'>
        <xs:annotation>
          <xs:documentation>
            The license code to validate or activate the hardware or software.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VERSION'>
        <xs:annotation>
          <xs:documentation>
            The version of the hardware or software. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RELEASE_DATE'>
        <xs:annotation>
          <xs:documentation>
            The date the hardware or software was released for general use.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INSTALL_DATE'>
        <xs:annotation>
          <xs:documentation>
            The date the hardware or software was installed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUFACTURER'>
        <xs:annotation>
          <xs:documentation>
            The corporate identity for the maker of the hardware or software.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UUID'>
        <xs:annotation>
          <xs:documentation>
            The globally unique identifier as specified in ISO 11578 or RFC
            4122.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SERIAL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A serial number that uniquely identifies a specific part.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RAW_MATERIAL'>
        <xs:annotation>
          <xs:documentation>
            A singular piece of material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOT'>
        <xs:annotation>
          <xs:documentation>
            A group of parts tracked as a lot.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BATCH'>
        <xs:annotation>
          <xs:documentation>
            A group of parts produced in a batch.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HEAT_TREAT'>
        <xs:annotation>
          <xs:documentation>
            A material heat number.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A particular part design or model.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_FAMILY'>
        <xs:annotation>
          <xs:documentation>
            A group of parts having similarities in geometry, manufacturing
            process, and/or functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NAME'>
        <xs:annotation>
          <xs:documentation>
            A word or set of words by which a part is known, addressed, or
            referred to.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_STEP'>
        <xs:annotation>
          <xs:documentation>
            A step in the process plan that this occurrence corresponds to. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_PLAN'>
        <xs:annotation>
          <xs:documentation>
            A process plan that a process occurrence belongs to.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ORDER_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The authorization of a process occurrence.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_NAME'>
        <xs:annotation>
          <xs:documentation>
            A word or set of words by which a process being executed (process
            occurrence) by the device is known, addressed, or referred to. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ISO_STEP_EXECUTABLE'>
        <xs:annotation>
          <xs:documentation>
            A reference to a ISO 10303 Executable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            Associated with the completion of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            Relating to logic or motion program currently executing.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumType'>
    <xs:annotation>
      <xs:documentation>
        The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemSubEnumEnum DataItemSubEnumExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsEnum'>
    <xs:annotation>
      <xs:documentation>
        Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AVERAGE'>
        <xs:annotation>
          <xs:documentation>
            Mathematical Average value calculated for the data item during the
            calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KURTOSIS'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. ~~A measure of the
            &quot;peakedness&quot; of a probability distribution; i.e., the
            shape of the distribution curve.~~
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAXIMUM'>
        <xs:annotation>
          <xs:documentation>
            Maximum or peak value recorded for the data item during the
            calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MEDIAN'>
        <xs:annotation>
          <xs:documentation>
            The middle number of a series of numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINIMUM'>
        <xs:annotation>
          <xs:documentation>
            Minimum value recorded for the data item during the calculation
            period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MODE'>
        <xs:annotation>
          <xs:documentation>
            The number in a series of numbers that occurs most often.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RANGE'>
        <xs:annotation>
          <xs:documentation>
            Difference between the maximum and minimum value of a data item
            during the calculation period. Also represents Peak-to-Peak
            measurement in a waveform.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROOT_MEAN_SQUARE'>
        <xs:annotation>
          <xs:documentation>
            Mathematical Root Mean Square (RMS) value calculated for the data
            item during the calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STANDARD_DEVIATION'>
        <xs:annotation>
          <xs:documentation>
            Statistical Standard Deviation value calculated for the data item
            during the calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsType'>
    <xs:annotation>
      <xs:documentation>
        Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemStatisticsEnum DataItemStatisticsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='UnitsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsEnum'>
    <xs:annotation>
      <xs:documentation>
        The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AMPERE'>
        <xs:annotation>
          <xs:documentation>
            Amps
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CELSIUS'>
        <xs:annotation>
          <xs:documentation>
            Degrees Celsius
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT'>
        <xs:annotation>
          <xs:documentation>
            A count of something.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECIBEL'>
        <xs:annotation>
          <xs:documentation>
            Sound Level
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE'>
        <xs:annotation>
          <xs:documentation>
            Angle in degrees
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE_3D'>
        <xs:annotation>
          <xs:documentation>
            A space-delimited, floating-point representation of the angular
            rotation in degrees around the X, Y, and Z axes relative to a
            cartesian coordinate system respectively in order as A, B, and C. If
            any of the rotations is not known, it **MUST** be zero (0).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Angular degrees per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Angular acceleration in degrees per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HERTZ'>
        <xs:annotation>
          <xs:documentation>
            Frequency measured in cycles per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOULE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOGRAM'>
        <xs:annotation>
          <xs:documentation>
            Kilograms
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Liters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MICRO_RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Tilt
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Millimeters
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in millimeters per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON'>
        <xs:annotation>
          <xs:documentation>
            Force in Newtons
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON_METER'>
        <xs:annotation>
          <xs:documentation>
            Torque, a unit for force times distance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OHM'>
        <xs:annotation>
          <xs:documentation>
            Measure of Electrical Resistance
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Newtons per square meter
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Viscosity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERCENT'>
        <xs:annotation>
          <xs:documentation>
            Percentage
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per minute
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SECOND'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SIEMENS/METER'>
        <xs:annotation>
          <xs:documentation>
            A measurement of Electrical Conductivity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT'>
        <xs:annotation>
          <xs:documentation>
            Volts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT'>
        <xs:annotation>
          <xs:documentation>
            Watts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of electrical energy, equal to one Joule
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRAM/CUBIC_METER'>
        <xs:annotation>
          <xs:documentation>
            Gram per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Geometric volume in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Change of geometric volume per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Change in geometric volume per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM'>
        <xs:annotation>
          <xs:documentation>
            Milligram.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM/CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Milligram per cubic millimeter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLILITER'>
        <xs:annotation>
          <xs:documentation>
            Milliliter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Counts per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Pascal per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNIT_VECTOR_3D'>
        <xs:annotation>
          <xs:documentation>
            A 3D Unit Vector. Space delimited list of three floating point
            numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsType'>
    <xs:annotation>
      <xs:documentation>
        The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='UnitsEnum UnitsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The units supported for the source equipment that can
        be converted into MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsEnum'>
    <xs:annotation>
      <xs:documentation>
        The units supported for the source equipment that can be converted into
        MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AMPERE'>
        <xs:annotation>
          <xs:documentation>
            Amps
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CELSIUS'>
        <xs:annotation>
          <xs:documentation>
            Degrees Celsius
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT'>
        <xs:annotation>
          <xs:documentation>
            A count of something.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECIBEL'>
        <xs:annotation>
          <xs:documentation>
            Sound Level
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE'>
        <xs:annotation>
          <xs:documentation>
            Angle in degrees
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE_3D'>
        <xs:annotation>
          <xs:documentation>
            A space-delimited, floating-point representation of the angular
            rotation in degrees around the X, Y, and Z axes relative to a
            cartesian coordinate system respectively in order as A, B, and C. If
            any of the rotations is not known, it **MUST** be zero (0).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Angular degrees per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Angular acceleration in degrees per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HERTZ'>
        <xs:annotation>
          <xs:documentation>
            Frequency measured in cycles per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOULE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOGRAM'>
        <xs:annotation>
          <xs:documentation>
            Kilograms
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Liters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MICRO_RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Tilt
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Millimeters
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in millimeters per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON'>
        <xs:annotation>
          <xs:documentation>
            Force in Newtons
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON_METER'>
        <xs:annotation>
          <xs:documentation>
            Torque, a unit for force times distance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OHM'>
        <xs:annotation>
          <xs:documentation>
            Measure of Electrical Resistance
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Newtons per square meter
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Viscosity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERCENT'>
        <xs:annotation>
          <xs:documentation>
            Percentage
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per minute
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SECOND'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SIEMENS/METER'>
        <xs:annotation>
          <xs:documentation>
            A measurement of Electrical Conductivity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT'>
        <xs:annotation>
          <xs:documentation>
            Volts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT'>
        <xs:annotation>
          <xs:documentation>
            Watts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of electrical energy, equal to one Joule
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRAM/CUBIC_METER'>
        <xs:annotation>
          <xs:documentation>
            Gram per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Geometric volume in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Change of geometric volume per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Change in geometric volume per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM'>
        <xs:annotation>
          <xs:documentation>
            Milligram.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM/CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Milligram per cubic millimeter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLILITER'>
        <xs:annotation>
          <xs:documentation>
            Milliliter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Counts per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Pascal per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNIT_VECTOR_3D'>
        <xs:annotation>
          <xs:documentation>
            A 3D Unit Vector. Space delimited list of three floating point
            numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CENTIPOISE'>
        <xs:annotation>
          <xs:documentation>
            A measure of viscosity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Rotational velocity in degrees per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAHRENHEIT'>
        <xs:annotation>
          <xs:documentation>
            Temperature in Fahrenheit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT'>
        <xs:annotation>
          <xs:documentation>
            Feet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Feet per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Feet per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in feet per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in feet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GALLON/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Gallons per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HOUR'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time in hours.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH'>
        <xs:annotation>
          <xs:documentation>
            Inches.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Inches per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Inches per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in inches per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH_POUND'>
        <xs:annotation>
          <xs:documentation>
            A measure of torque in inch pounds.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in inches.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KELVIN'>
        <xs:annotation>
          <xs:documentation>
            A measurement of temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOWATT'>
        <xs:annotation>
          <xs:documentation>
            A measurement in kilowatt.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOWATT_HOUR'>
        <xs:annotation>
          <xs:documentation>
            Kilowatt hours which is 3.6 mega joules.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Measurement of rate of flow of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Velocity in millimeters per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINUTE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time in minutes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OTHER'>
        <xs:annotation>
          <xs:documentation>
            Unsupported units.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POUND'>
        <xs:annotation>
          <xs:documentation>
            US pounds.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POUND/INCH^2'>
        <xs:annotation>
          <xs:documentation>
            Pressure in pounds per square inch (PSI).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Angle in radians.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Velocity in radians per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Rotational acceleration in radian per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Rotational acceleration in radian per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Rotational velocity in revolution per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BAR'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Bar.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TORR'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Torr.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_MERCURY'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Millimeter of Mercury (mmHg).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Pascal per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsType'>
    <xs:annotation>
      <xs:documentation>
        The units supported for the source equipment that can be converted into
        MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='NativeUnitsEnum NativeUnitsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='CoordinateSystemEnumType'>
    <xs:annotation>
      <xs:documentation>
        The coordinate system to be used for the position
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MACHINE'>
        <xs:annotation>
          <xs:documentation>
            An unchangeable coordinate system that has machine zero as its
            origin.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORK'>
        <xs:annotation>
          <xs:documentation>
            The coordinate system that represents the working area for a
            particular workpiece whose origin is shifted within the `MACHINE`
            coordinate system. If the `WORK` coordinates are not currently
            defined in the piece of equipment, the `MACHINE` coordinates will be
            used.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueEnum'>
    <xs:annotation>
      <xs:documentation>
        The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTION_COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} that is measuring an action or
            operation is to be reset upon completion of that action or
            operation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANNUAL'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            12-month period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DAY'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            24-hour period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIFE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is not reset and accumulates
            for the entire life of the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset upon completion
            of a maintenance event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MONTH'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            monthly period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_ON'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset when power was
            applied to the piece of equipment after a planned or unplanned
            interruption of power has occurred.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SHIFT'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            work shift.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WEEK'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            7-day period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueType'>
    <xs:annotation>
      <xs:documentation>
        The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemResetValueEnum DataItemResetValueExtType'/>
  </xs:simpleType>
  <xs:attributeGroup name='HeaderAttributesType'>
    <xs:attribute name='version' type='VersionType' use='required'>
      <xs:annotation>
        <xs:documentation>
          unique identifier of the administered item. {{cite(ISO/IEC
          11179-:2015)}}
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='creationTime' type='CreationTimeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The time the file was created.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='testIndicator' type='TestIndicatorType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Indicates that this was a test document
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='instanceId' type='InstanceIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique instance identifier of this agent process
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sender' type='SenderType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The sender of the message
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='deviceModelChangeTime' type='DeviceModelChangeTimeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A timestamp in 8601 format of the last update of the Device
          information for any device
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:simpleType name='AssetCountValueType'>
    <xs:annotation>
      <xs:documentation>
        The number of assets
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='0'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AssetCountsType'>
    <xs:annotation>
      <xs:documentation>
        The total number of mtconnect asset in anagent.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='AssetCount' type='AssetCountType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The total number of mtconnect asset in anagent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='AssetCountType'>
    <xs:annotation>
      <xs:documentation>
        The total number of mtconnect asset in anagent.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='AssetCountValueType'>
        <xs:attribute name='assetType' type='AssetAttrTypeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of asset that was updated.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='HeaderType'>
    <xs:annotation>
      <xs:documentation>
        Supplemental data usually placed at the beginning of a
        {{term(Document)}}.
      </xs:documentation>
    </xs:annotation>
	<xs:sequence>
      <xs:element name='AssetCounts' type='AssetCountsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The total number of mtconnect asset in anagent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
	<xs:attributeGroup ref='HeaderAttributesType'/>
	<xs:attribute name='bufferSize' type='BufferSizeType' use='required'>
	  <xs:annotation>
		<xs:documentation>
		  The size of the agent&apos;s buffer.
		</xs:documentation>
	  </xs:annotation>
	</xs:attribute>
	<xs:attribute name='assetBufferSize' type='AssetBufferSizeType' use='required'>
	  <xs:annotation>
		<xs:documentation>
		  The maximum number of assets
		</xs:documentation>
	  </xs:annotation>
	</xs:attribute>
	<xs:attribute name='assetCount' type='AssetCountAttrType' use='required'>
	  <xs:annotation>
		<xs:documentation>
		  The number of assets we have
		</xs:documentation>
	  </xs:annotation>
	</xs:attribute>
  </xs:complexType>
  <xs:complexType name='MTConnectDevicesType'>
    <xs:annotation>
      <xs:documentation>
        The root node for MTConnect
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Header' type='HeaderType'>
        <xs:annotation>
          <xs:documentation>
            Supplemental data usually placed at the beginning of a
            {{term(Document)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Devices' type='DevicesType'>
        <xs:annotation>
          <xs:documentation>
            {{block(Devices)}} **MUST** {{term(organize)}} one or more
            {{block(Device)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='StationType'>
    <xs:annotation>
      <xs:documentation>
        The station id for this device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='Iso841ClassType'>
    <xs:annotation>
      <xs:documentation>
        The ISO 841 classification for the device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:simpleType name='ModelType'>
    <xs:annotation>
      <xs:documentation>
        The model name
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='DevicesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Devices)}} **MUST** {{term(organize)}} one or more
        {{block(Device)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Agent' type='AgentType'>
        <xs:annotation>
          <xs:documentation>
            Software that collects data published from one or more piece(s) of
            equipment, organizes that data in a structured manner, and responds
            to requests for data from client software systems by providing a
            structured response in the form of a {{term(Response Document)}}
            that is constructed using the {{term(semantic data model)}} of a
            Standard. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Device' type='DeviceType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Device)}} is a {{term(Component)}} representing a piece of
            equipment or a manufacturing system that produces observations about
            itself or publishes data. It organizes its parts as
            {{termplural(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ComponentType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Structural Element)}} that represents a physical or logical
        part or subpart of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Configuration' type='ComponentConfigurationType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Configuration)}} contains technical information about a
            piece of equipment describing its physical layout, functional
            characteristics, and relationships with other pieces of equipment.
            See {{sect(Configuration)}} for details on {{block(Configuration)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='DataItems' type='DataItemsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation/>
        </xs:annotation>
      </xs:element>
      <xs:element name='Components' type='ComponentsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Components)}} {{termplural(organize)}} {{block(Component)}}
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Compositions' type='CompositionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Compositions Model
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='References' type='ReferencesType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            References Model
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeName' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The device manufacturer component name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleInterval' type='SampleIntervalType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The rate at which the data is sampled from the component
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          DEPRECATED: The rate at which the data is sampled from the component
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Component' type='ComponentType'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Structural Element)}} that represents a physical or logical
        part or subpart of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The descriptive information. This can be manufacturer specific
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The content of the description can text or XML elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
    <xs:attribute name='manufacturer' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The manufacturer
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='model' type='ModelType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The model
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='serialNumber' type='SerialNumberAttrType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The serial number associated with a {{block(Component)}},
          {{block(Asset)}}, or {{block(Device)}}.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='station' type='StationType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          A storage or mounting location for a tool associated with a
          {{block(Turret)}}, {{block(GangToolBar)}}, or {{block(ToolRack)}}.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='CommonComponentType'>
    <xs:annotation>
      <xs:documentation>
        An abstract component that has an optional uuid
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ComponentType'>
        <xs:attribute name='uuid' type='UuidType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component&apos;s universally unique id.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component&apos;s name
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='CommonComponent' type='CommonComponentType' substitutionGroup='Component'>
    <xs:annotation>
      <xs:documentation>
        An abstract component that has an optional uuid
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Components)}} {{termplural(organize)}} {{block(Component)}}
        elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Component' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DeviceType'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Device)}} is a {{term(Component)}} representing a piece of
        equipment or a manufacturing system that produces observations about
        itself or publishes data. It organizes its parts as
        {{termplural(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ComponentType'>
        <xs:attribute name='iso841Class' type='Iso841ClassType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              DEPRECATED: The device&apos;s ISO-841 classification
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='uuid' type='UuidType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The components universally unique id. This can be composed of the
              manufactures id or name and the serial number.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The Device name.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='mtconnectVersion' type='VersionType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The MTConnect version of the {{term(Devices Information Model)}}
              used to configure the information to be published for a piece of
              equipment in an {{term(MTConnect Response Document)}}.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Device' type='DeviceType' substitutionGroup='Component'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Device)}} is a {{term(Component)}} representing a piece of
        equipment or a manufacturing system that produces observations about
        itself or publishes data. It organizes its parts as
        {{termplural(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AgentType'>
    <xs:annotation>
      <xs:documentation>
        Software that collects data published from one or more piece(s) of
        equipment, organizes that data in a structured manner, and responds to
        requests for data from client software systems by providing a structured
        response in the form of a {{term(Response Document)}} that is
        constructed using the {{term(semantic data model)}} of a Standard. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='DeviceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Agent' type='AgentType' substitutionGroup='Device'>
    <xs:annotation>
      <xs:documentation>
        Software that collects data published from one or more piece(s) of
        equipment, organizes that data in a structured manner, and responds to
        requests for data from client software systems by providing a structured
        response in the form of a {{term(Response Document)}} that is
        constructed using the {{term(semantic data model)}} of a Standard. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ActuatorType'>
    <xs:annotation>
      <xs:documentation>
        A mechanism for moving or controlling a mechanical part of a piece of
        equipment. It takes energy usually provided by air, electric current, or
        liquid and converts the energy into some kind of motion. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Actuator' type='ActuatorType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanism for moving or controlling a mechanical part of a piece of
        equipment. It takes energy usually provided by air, electric current, or
        liquid and converts the energy into some kind of motion. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AuxiliaryType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliary)}} is a {{block(Component)}} that represents
        functional sub-system(s) that provides supplementary or extended
        capabilities for a piece of equipment, but they are not required for the
        basic operation of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Auxiliary' type='AuxiliaryType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliary)}} is a {{block(Component)}} that represents
        functional sub-system(s) that provides supplementary or extended
        capabilities for a piece of equipment, but they are not required for the
        basic operation of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxisType'>
    <xs:annotation>
      <xs:documentation>
        Description
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Axis' type='AxisType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        Description
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='BarFeederType'>
    <xs:annotation>
      <xs:documentation>
        {{block(BarFeeder)}} represents the information for a unit involved in
        delivering bar stock to a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='LoaderType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='BarFeeder' type='BarFeederType' substitutionGroup='Loader'>
    <xs:annotation>
      <xs:documentation>
        {{block(BarFeeder)}} represents the information for a unit involved in
        delivering bar stock to a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ChuckType'>
    <xs:annotation>
      <xs:documentation>
        A mechanism that holds a part, stock material, or any other item in
        place.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Chuck' type='ChuckType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanism that holds a part, stock material, or any other item in
        place.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControllerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Controller)}} organizes information about an intelligent or
        computational function within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Controller' type='ControllerType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Controller)}} organizes information about an intelligent or
        computational function within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoolantType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Coolant)}} represents the information for a system comprised of
        all the parts involved in distribution and management of fluids that
        remove heat from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Coolant' type='CoolantType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Coolant)}} represents the information for a system comprised of
        all the parts involved in distribution and management of fluids that
        remove heat from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Deposition)}} represents the information for a system that
        manages the addition of material or state change of material being
        performed in an additive manufacturing process. For example, this could
        describe the portion of a piece of equipment that manages a material
        extrusion process or a vat polymerization process.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Deposition' type='DepositionType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Deposition)}} represents the information for a system that
        manages the addition of material or state change of material being
        performed in an additive manufacturing process. For example, this could
        describe the portion of a piece of equipment that manages a material
        extrusion process or a vat polymerization process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DielectricType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Dielectric)}} represents the information for a system that
        manages a chemical mixture used in a manufacturing process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Dielectric' type='DielectricType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Dielectric)}} represents the information for a system that
        manages a chemical mixture used in a manufacturing process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DoorType'>
    <xs:annotation>
      <xs:documentation>
        A mechanical mechanism or closure that can cover a physical access
        portal into a piece of equipment allowing or restricting access to other
        parts of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Door' type='DoorType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanical mechanism or closure that can cover a physical access
        portal into a piece of equipment allowing or restricting access to other
        parts of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ElectricType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Electric)}} represents the information for the main power supply
        for device piece of equipment and the distribution of that power
        throughout the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Electric' type='ElectricType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Electric)}} represents the information for the main power supply
        for device piece of equipment and the distribution of that power
        throughout the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EnclosureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Enclosure)}} represents the information for a structure used to
        contain or isolate a piece of equipment or area.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Enclosure' type='EnclosureType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Enclosure)}} represents the information for a structure used to
        contain or isolate a piece of equipment or area.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EndEffectorType'>
    <xs:annotation>
      <xs:documentation>
        {{block(EndEffector)}} represents the information for those functions
        that form the last link segment of a piece of equipment. It is the part
        of a piece of equipment that interacts with the manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='EndEffector' type='EndEffectorType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(EndEffector)}} represents the information for those functions
        that form the last link segment of a piece of equipment. It is the part
        of a piece of equipment that interacts with the manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EnvironmentalType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Environmental)}} represents the information for a unit or
        function involved in monitoring, managing, or conditioning the
        environment around or within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Environmental' type='EnvironmentalType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Environmental)}} represents the information for a unit or
        function involved in monitoring, managing, or conditioning the
        environment around or within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FeederType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Feeder)}} represents the information for a system that manages
        the delivery of materials within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Feeder' type='FeederType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Feeder)}} represents the information for a system that manages
        the delivery of materials within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HydraulicType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Hydraulic)}} represents the information for a system comprised
        of all the parts involved in moving and distributing pressurized liquid
        throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Hydraulic' type='HydraulicType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Hydraulic)}} represents the information for a system comprised
        of all the parts involved in moving and distributing pressurized liquid
        throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='InterfaceType'>
    <xs:annotation>
      <xs:documentation>
        The means by which communication is achieved between independent
        systems.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Interface' type='InterfaceType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        The means by which communication is achieved between independent
        systems.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinearType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Linear)}} axis represents the movement of a physical piece of
        equipment, or a portion of the equipment, in a straight line. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AxisType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Linear' type='LinearType' substitutionGroup='Axis'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Linear)}} axis represents the movement of a physical piece of
        equipment, or a portion of the equipment, in a straight line. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LoaderType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Loader)}} represents the information for a unit comprised of all
        the parts involved in moving and distributing materials, parts, tooling,
        and other items to or from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Loader' type='LoaderType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(Loader)}} represents the information for a unit comprised of all
        the parts involved in moving and distributing materials, parts, tooling,
        and other items to or from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LubricationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Lubrication)}} represents the information for a system comprised
        of all the parts involved in distribution and management of fluids used
        to lubricate portions of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Lubrication' type='LubricationType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Lubrication)}} represents the information for a system comprised
        of all the parts involved in distribution and management of fluids used
        to lubricate portions of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Materials)}} provides information about materials or other items
        consumed or used by the piece of equipment for production of parts,
        materials, or other types of goods.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ResourceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Materials' type='MaterialType' substitutionGroup='Resource'>
    <xs:annotation>
      <xs:documentation>
        {{block(Materials)}} provides information about materials or other items
        consumed or used by the piece of equipment for production of parts,
        materials, or other types of goods.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Path)}} represents the information for an independent operation
        or function within a {{block(Controller)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Path' type='PathType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Path)}} represents the information for an independent operation
        or function within a {{block(Controller)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PersonnelType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Personnel)}} provides information about an individual or
        individuals who either control, support, or otherwise interface with a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ResourceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Personnel' type='PersonnelType' substitutionGroup='Resource'>
    <xs:annotation>
      <xs:documentation>
        {{block(Personnel)}} provides information about an individual or
        individuals who either control, support, or otherwise interface with a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PneumaticType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pneumatic)}} is a system that uses compressed gasses to actuate
        components or do work within the piece of equipment. Note: Actuation is
        usually performed using a cylinder.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Pneumatic' type='PneumaticType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pneumatic)}} is a system that uses compressed gasses to actuate
        components or do work within the piece of equipment. Note: Actuation is
        usually performed using a cylinder.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PowerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Power)}} was **DEPRECATED** in *MTConnect Version 1.1* and was
        replaced by {{block(Availability)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Power' type='PowerType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Power)}} was **DEPRECATED** in *MTConnect Version 1.1* and was
        replaced by {{block(Availability)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessPowerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessPower)}} represents the information for a power source
        associated with a piece of equipment that supplies energy to the
        manufacturing process separate from the {{block(Electric)}} system.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessPower' type='ProcessPowerType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessPower)}} represents the information for a power source
        associated with a piece of equipment that supplies energy to the
        manufacturing process separate from the {{block(Electric)}} system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProtectiveType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Protective)}} represents the information for those functions
        that detect or prevent harm or damage to equipment or personnel.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Protective' type='ProtectiveType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Protective)}} represents the information for those functions
        that detect or prevent harm or damage to equipment or personnel.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResourceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resource)}} is an abstract {{block(Component)}} that represents
        types of items, materials, and personnel that support the operation of a
        piece of equipment or work to be performed at a location.
        {{block(Resource)}} also represents materials or other items consumed or
        transformed by a piece of equipment for production of parts or other
        types of goods.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Resource' type='ResourceType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resource)}} is an abstract {{block(Component)}} that represents
        types of items, materials, and personnel that support the operation of a
        piece of equipment or work to be performed at a location.
        {{block(Resource)}} also represents materials or other items consumed or
        transformed by a piece of equipment for production of parts or other
        types of goods.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotaryType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Rotary)}} axis represents any non-linear or rotary movement of
        a physical piece of equipment or a portion of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AxisType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Rotary' type='RotaryType' substitutionGroup='Axis'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Rotary)}} axis represents any non-linear or rotary movement of
        a physical piece of equipment or a portion of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SensorType'>
    <xs:annotation>
      <xs:documentation>
        A {{term(sensing element)}} that responds to a physical stimulus and
        transmits a resulting signal.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Sensor' type='SensorType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        A {{term(sensing element)}} that responds to a physical stimulus and
        transmits a resulting signal.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StockType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Stock)}} represents the information for the material that is
        used in a manufacturing process and to which work is applied in a
        machine or piece of equipment to produce parts.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='MaterialType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Stock' type='StockType' substitutionGroup='Materials'>
    <xs:annotation>
      <xs:documentation>
        {{block(Stock)}} represents the information for the material that is
        used in a manufacturing process and to which work is applied in a
        machine or piece of equipment to produce parts.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SystemType'>
    <xs:annotation>
      <xs:documentation>
        {{block(System)}} is a {{block(Component)}} that represents the major
        sub-system(s) that are permanently integrated into a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='System' type='SystemType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(System)}} is a {{block(Component)}} that represents the major
        sub-system(s) that are permanently integrated into a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolingDeliveryType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ToolingDelivery)}} represents the information for a unit
        involved in managing, positioning, storing, and delivering tooling
        within a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolingDelivery' type='ToolingDeliveryType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(ToolingDelivery)}} represents the information for a unit
        involved in managing, positioning, storing, and delivering tooling
        within a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WasteDisposalType'>
    <xs:annotation>
      <xs:documentation>
        {{block(WasteDisposal)}} represents the information for a unit comprised
        of all the parts involved in removing manufacturing byproducts from a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WasteDisposal' type='WasteDisposalType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(WasteDisposal)}} represents the information for a unit comprised
        of all the parts involved in removing manufacturing byproducts from a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StructureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structure)}} is a {{block(Component)}} that represents the
        part(s) comprising the rigid bodies of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Structure' type='StructureType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structure)}} is a {{block(Component)}} that represents the
        part(s) comprising the rigid bodies of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinkType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Link)}} is a structural {{block(Component)}} providing a
        connection between {{block(Component)}}s.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='StructureType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Link' type='LinkType' substitutionGroup='Structure'>
    <xs:annotation>
      <xs:documentation>
        {{block(Link)}} is a structural {{block(Component)}} providing a
        connection between {{block(Component)}}s.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TableType'>
    <xs:annotation>
      <xs:documentation>
        A surface for holding an object or material
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='StructureType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Table' type='TableType' substitutionGroup='Structure'>
    <xs:annotation>
      <xs:documentation>
        A surface for holding an object or material
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkEnvelopeType'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WorkEnvelope' type='WorkEnvelopeType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='GangToolBarType'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s. Tools are positioned for use in the
        manufacturing process by linearly positioning the
        {{block(GangToolBar)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='GangToolBar' type='GangToolBarType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s. Tools are positioned for use in the
        manufacturing process by linearly positioning the
        {{block(GangToolBar)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HeatingType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Heating)}} is a system used to deliver controlled amounts of
        heat to achieve a target temperature at a specified heating rate. Note:
        As an example, Energy Delivery Method can be either through Electric
        heaters or Gas burners.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Heating' type='HeatingType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Heating)}} is a system used to deliver controlled amounts of
        heat to achieve a target temperature at a specified heating rate. Note:
        As an example, Energy Delivery Method can be either through Electric
        heaters or Gas burners.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AutomaticToolChangerType'>
    <xs:annotation>
      <xs:documentation>
        A tool delivery mechanism that moves tools between a
        {{block(ToolMagazine)}} and a {{term(Spindle)}} a {{block(Turret)}}. An
        {{block(AutomaticToolChanger)}} may also transfer tools between a
        location outside of a piece of equipment and a {{block(ToolMagazine)}}
        or {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='AutomaticToolChanger' type='AutomaticToolChangerType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool delivery mechanism that moves tools between a
        {{block(ToolMagazine)}} and a {{term(Spindle)}} a {{block(Turret)}}. An
        {{block(AutomaticToolChanger)}} may also transfer tools between a
        location outside of a piece of equipment and a {{block(ToolMagazine)}}
        or {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Process)}} is an abstract {{block(Component)}} type that
        represents the manufacturing process being executed on a piece of
        equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Process' type='ProcessType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Process)}} is an abstract {{block(Component)}} type that
        represents the manufacturing process being executed on a piece of
        equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolMagazineType'>
    <xs:annotation>
      <xs:documentation>
        A tool storage mechanism that holds any number of tools. Tools are
        located in {{block(Pot)}}s. {{block(Pot)}}s are moved into position to
        transfer tools into or out of the {{block(ToolMagazine)}} by an
        {{block(AutomaticToolChanger)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolMagazine' type='ToolMagazineType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool storage mechanism that holds any number of tools. Tools are
        located in {{block(Pot)}}s. {{block(Pot)}}s are moved into position to
        transfer tools into or out of the {{block(ToolMagazine)}} by an
        {{block(AutomaticToolChanger)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartOccurrenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(PartOccurrence)}} {{term(organize)}} information about a
        specific part as it exists at a specific place and time, such as a
        specific instance of a bracket at a specific timestamp.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ProcessType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='PartOccurrence' type='PartOccurrenceType' substitutionGroup='Process'>
    <xs:annotation>
      <xs:documentation>
        {{block(PartOccurrence)}} {{term(organize)}} information about a
        specific part as it exists at a specific place and time, such as a
        specific instance of a bracket at a specific timestamp.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdapterType'>
    <xs:annotation>
      <xs:documentation>
        An optional piece of hardware or software that transforms information
        provided by a piece of equipment into a form that can be received by an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Adapter' type='AdapterType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An optional piece of hardware or software that transforms information
        provided by a piece of equipment into a form that can be received by an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolRackType'>
    <xs:annotation>
      <xs:documentation>
        A linear or matrixed tool storage mechanism that holds any number of
        tools. Tools are located in {{block(Station)}}s.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolRack' type='ToolRackType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A linear or matrixed tool storage mechanism that holds any number of
        tools. Tools are located in {{block(Station)}}s.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TurretType'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s . Tools are positioned for use in the
        manufacturing process by rotating the {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Turret' type='TurretType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s . Tools are positioned for use in the
        manufacturing process by rotating the {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VacuumType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Vacuum)}} is a system that evacuates gases and liquids from an
        enclosed and sealed space to a controlled negative pressure or a
        molecular density below the prevailing atmospheric level.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Vacuum' type='VacuumType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Vacuum)}} is a system that evacuates gases and liquids from an
        enclosed and sealed space to a controlled negative pressure or a
        molecular density below the prevailing atmospheric level.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoolingType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Cooling)}} is a system used to to extract controlled amounts of
        heat to achieve a target temperature at a specified cooling rate. Note:
        As an example, Energy Extraction Method can be via cooling water pipes
        running through the chamber.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Cooling' type='CoolingType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Cooling)}} is a system used to to extract controlled amounts of
        heat to achieve a target temperature at a specified cooling rate. Note:
        As an example, Energy Extraction Method can be via cooling water pipes
        running through the chamber.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OrganizerType'>
    <xs:annotation>
      <xs:documentation>
        {{Organizer}} is an abstract {{block(Component)}} that
        {{termplural(organize)}} similar {{block(Component)}} types together.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Organizer' type='OrganizerType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{Organizer}} is an abstract {{block(Component)}} that
        {{termplural(organize)}} similar {{block(Component)}} types together.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessOccurrenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessOccurrence)}} {{termplural(organize)}} information about
        the execution of a specific process that takes place at a specific place
        and time, such as a specific instance of part-milling occurring at a
        specific timestamp.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ProcessType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessOccurrence' type='ProcessOccurrenceType' substitutionGroup='Process'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessOccurrence)}} {{termplural(organize)}} information about
        the execution of a specific process that takes place at a specific place
        and time, such as a specific instance of part-milling occurring at a
        specific timestamp.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pressure)}} is a system that delivers compressed gas or fluid
        and controls the pressure and rate of pressure change to a desired
        target set-point. Note: For example, Delivery Method can be a Compressed
        Air or N2 tank that is piped via an inlet valve to the chamber.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Pressure' type='PressureType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pressure)}} is a system that delivers compressed gas or fluid
        and controls the pressure and rate of pressure change to a desired
        target set-point. Note: For example, Delivery Method can be a Compressed
        Air or N2 tank that is piped via an inlet valve to the chamber.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StructuresType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structures)}} {{termplural(organize)}} {{block(Structure)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Structures' type='StructuresType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structures)}} {{termplural(organize)}} {{block(Structure)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Axes)}} {{termplural(organize)}} {{block(Axis)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Axes' type='AxesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Axes)}} {{termplural(organize)}} {{block(Axis)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='InterfacesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Interfaces)}} {{termplural(organize)}} {{block(Interface)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Interfaces' type='InterfacesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Interfaces)}} {{termplural(organize)}} {{block(Interface)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SystemsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Systems)}} {{termplural(organize)}} {{block(System)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Systems' type='SystemsType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Systems)}} {{termplural(organize)}} {{block(System)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResourcesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resources)}} {{termplural(organize)}} {{block(Resource)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Resources' type='ResourcesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resources)}} {{termplural(organize)}} {{block(Resource)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AuxiliariesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliaries)}} {{termplural(organize)}} {{block(Auxiliary)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Auxiliaries' type='AuxiliariesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliaries)}} {{termplural(organize)}} {{block(Auxiliary)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Processes)}} {{termplural(organize)}} {{block(Process)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Processes' type='ProcessesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Processes)}} {{termplural(organize)}} {{block(Process)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdaptersType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Adapters)}} {{termplural(organize)}} {{block(Adapter)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Adapters' type='AdaptersType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Adapters)}} {{termplural(organize)}} {{block(Adapter)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CompositionsType'>
    <xs:annotation>
      <xs:documentation>
        Compositions Model
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Composition' type='CompositionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            {{block(Composition)}} is a functional part of a piece of equipment
            contained within a {{block(Component)}} that **MUST NOT** be further
            decomposed into {{block(Component)}}s or {{block(Composition)}}s. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='CompositionEnumTypeExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The vocab for the type of composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CompositionEnumTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The vocab for the type of composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTUATOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for moving or controlling a mechanical part of a piece
            of equipment. It takes energy usually provided by air, electric
            current, or liquid and converts the energy into some kind of motion.
            
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPLIFIER'>
        <xs:annotation>
          <xs:documentation>
            An electronic component or circuit for amplifying power, electric
            current, or voltage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BALLSCREW'>
        <xs:annotation>
          <xs:documentation>
            A mechanical structure for transforming rotary motion into linear
            motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BELT'>
        <xs:annotation>
          <xs:documentation>
            An endless flexible band used to transmit motion for a piece of
            equipment or to convey materials and objects.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BRAKE'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for slowing or stopping a moving object by the
            absorption or transfer of the energy of momentum, usually by means
            of friction, electrical force, or magnetic force.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHAIN'>
        <xs:annotation>
          <xs:documentation>
            An interconnected series of objects that band together and are used
            to transmit motion for a piece of equipment or to convey materials
            and objects.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHOPPER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to break material into smaller pieces.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that holds a part, stock material, or any other item in
            place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUTE'>
        <xs:annotation>
          <xs:documentation>
            An inclined channel for conveying material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CIRCUIT_BREAKER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for interrupting an electric circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLAMP'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to strengthen, support, or fasten objects in place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPRESSOR'>
        <xs:annotation>
          <xs:documentation>
            A pump or other mechanism for reducing volume and increasing
            pressure of gases in order to condense the gases to drive
            pneumatically powered pieces of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DOOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanical mechanism or closure that can cover a physical access
            portal into a piece of equipment allowing or restricting access to
            other parts of the equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DRAIN'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that allows material to flow for the purpose of drainage
            from, for example, a vessel or tank.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ENCODER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to measure rotary position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPOSURE_UNIT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for emitting a type of radiation
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXTRUSION_UNIT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for dispensing liquid or powered materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAN'>
        <xs:annotation>
          <xs:documentation>
            Any mechanism for producing a current of air.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FILTER'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GALVANOMOTOR'>
        <xs:annotation>
          <xs:documentation>
            An electromechanical actuator that produces deflection of a beam of
            light or energy in response to electric current through its coil in
            a magnetic field.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRIPPER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that holds a part, stock material, or any other item in
            place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HOPPER'>
        <xs:annotation>
          <xs:documentation>
            A chamber or bin in which materials are stored temporarily,
            typically being filled through the top and dispensed through the
            bottom.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR_POSITION_FEEDBACK'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that measures linear motion or position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that converts electrical, pneumatic, or hydraulic energy
            into mechanical energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OIL'>
        <xs:annotation>
          <xs:documentation>
            A viscous liquid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_SUPPLY'>
        <xs:annotation>
          <xs:documentation>
            A unit that provides power to electric mechanisms.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PULLEY'>
        <xs:annotation>
          <xs:documentation>
            A mechanism or wheel that turns in a frame or block and serves to
            change the direction of or to transmit force.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PUMP'>
        <xs:annotation>
          <xs:documentation>
            An apparatus raising, driving, exhausting, or compressing fluids or
            gases by means of a piston, plunger, or set of rotating vanes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REEL'>
        <xs:annotation>
          <xs:documentation>
            A rotary storage unit for material
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SENSING_ELEMENT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that provides a signal or measured value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPREADER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for flattening or spreading materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STORAGE_BATTERY'>
        <xs:annotation>
          <xs:documentation>
            A component consisting of one or more cells, in which chemical
            energy is converted into electricity and used as a source of power. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SWITCH'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for turning on or off an electric current or for making
            or breaking a circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TABLE'>
        <xs:annotation>
          <xs:documentation>
            A surface for holding an object or material
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TANK'>
        <xs:annotation>
          <xs:documentation>
            A receptacle or container for holding material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TENSIONER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that provides or applies a stretch or strain to another
            mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFORMER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that transforms electric energy from a source to a
            secondary circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VALVE'>
        <xs:annotation>
          <xs:documentation>
            Any mechanism for halting or controlling the flow of a liquid, gas,
            or other material through a passage, pipe, inlet, or outlet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VAT'>
        <xs:annotation>
          <xs:documentation>
            A container for liquid or powdered materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATER'>
        <xs:annotation>
          <xs:documentation>
            A fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WIRE'>
        <xs:annotation>
          <xs:documentation>
            A string like piece or filament of relatively rigid or flexible
            material provided in a variety of diameters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORKPIECE'>
        <xs:annotation>
          <xs:documentation>
            An object or material on which a form of work is performed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COOLING_TOWER'>
        <xs:annotation>
          <xs:documentation>
            A heat exchange system that uses a fluid to transfer heat to the
            atmosphere.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POT'>
        <xs:annotation>
          <xs:documentation>
            A tool storage location associated with a {{block(ToolMagazine)}} or
            {{block(AutomaticToolChanger)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STATION'>
        <xs:annotation>
          <xs:documentation>
            A storage or mounting location for a tool associated with a
            {{block(Turret)}}, {{block(GangToolBar)}}, or {{block(ToolRack)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFER_ARM'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for physically moving a tool from one location to
            another.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFER_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool awaiting transfer from a
            {{block(ToolMagazine)}} to {{term(Spindle)}} or {{block(Turret)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RETURN_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool removed from {{term(Spindle)}} or
            {{block(Turret)}} and awaiting for return to a
            {{block(ToolMagazine)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STAGING_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool awaiting transfer to a
            {{block(ToolMagazine)}} or {{block(Turret)}} from outside of the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REMOVAL_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool to be removed from a
            {{block(ToolMagazine)}} or {{block(Turret)}} to a location outside
            of the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPIRED_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool that is no longer useable for removal
            from a {{block(ToolMagazine)}} or {{block(Turret)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CompositionEnumTypeType'>
    <xs:annotation>
      <xs:documentation>
        The vocab for the type of composition
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='CompositionEnumTypeEnum CompositionEnumTypeExtType'/>
  </xs:simpleType>
  <xs:complexType name='CompositionType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Composition)}} is a functional part of a piece of equipment
        contained within a {{block(Component)}} that **MUST NOT** be further
        decomposed into {{block(Component)}}s or {{block(Composition)}}s. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Configuration' type='ComponentConfigurationType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Configuration)}} contains technical information about a
            piece of equipment describing its physical layout, functional
            characteristics, and relationships with other pieces of equipment.
            See {{sect(Configuration)}} for details on {{block(Configuration)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='uuid' type='UuidType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The composition&apos;s universally unique id.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The data item identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='CompositionEnumTypeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of composition
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:simpleType name='IdRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to an identifier
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:complexType name='ReferencesType'>
    <xs:annotation>
      <xs:documentation>
        References Model
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Reference' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ReferenceType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Reference)}} is a pointer to information that is associated with
        another {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='idRef' type='IdRefType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A reference to an id in the MTConnectDevices model
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          An optional name of the referenced item, used for documentation
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Reference' type='ReferenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Reference)}} is a pointer to information that is associated with
        another {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DataItemRefType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItemRef)}} is a pointer to a {{term(Data Entity)}}
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(DataItemRef)}} allows the data associated with a
        data item defined in another {{term(Structural Element)}} to be directly
        associated with this element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ReferenceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DataItemRef' type='DataItemRefType' substitutionGroup='Reference'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItemRef)}} is a pointer to a {{term(Data Entity)}}
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(DataItemRef)}} allows the data associated with a
        data item defined in another {{term(Structural Element)}} to be directly
        associated with this element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRefType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRef)}} is a pointer to all of the information
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(ComponentRef)}} allows all of the information
        ({{term(Lower Level)}} {{block(Components)}} and all {{termplural(Data
        Entity)}}) that is associated with the other {{term(Structural
        Element)}} to be directly associated with this element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ReferenceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ComponentRef' type='ComponentRefType' substitutionGroup='Reference'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRef)}} is a pointer to all of the information
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(ComponentRef)}} allows all of the information
        ({{term(Lower Level)}} {{block(Components)}} and all {{termplural(Data
        Entity)}}) that is associated with the other {{term(Structural
        Element)}} to be directly associated with this element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AbstractConfigurationType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        Abstract configuration
      </xs:documentation>
    </xs:annotation>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractConfiguration' type='AbstractConfigurationType'>
    <xs:annotation>
      <xs:documentation>
        Abstract configuration
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentConfigurationType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The configuration data associated with this component.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='AbstractConfiguration' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='CalibrationDateType'>
    <xs:annotation>
      <xs:documentation>
        The time the calibration was preformed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:date'/>
  </xs:simpleType>
  <xs:simpleType name='NextCalibrationDateType'>
    <xs:annotation>
      <xs:documentation>
        The time the next calibration should be preformed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:date'/>
  </xs:simpleType>
  <xs:simpleType name='CalibrationInitialsType'>
    <xs:annotation>
      <xs:documentation>
        The initials of the person doing the calibration
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='FirmwareVersionType'>
    <xs:annotation>
      <xs:documentation>
        The firmware version of this sensor
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='ChannelNumberType'>
    <xs:annotation>
      <xs:documentation>
        The channel number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:complexType name='SensorConfigurationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(SensorConfiguration)}} contains configuration information about
        a {{block(Sensor)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='FirmwareVersion' type='FirmwareVersionType'>
            <xs:annotation>
              <xs:documentation>
                Version number for the sensor unit as specified by the
                manufacturer. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='CalibrationDate' type='CalibrationDateType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                Date upon which the {{term(sensor unit)}} was last calibrated to
                the {{term(sensor element)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                Date upon which the {{term(sensor element)}} is next scheduled
                to be calibrated with the {{term(sensor unit)}}. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='CalibrationInitials' type='CalibrationInitialsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The initials of the person verifying the validity of the
                calibration data.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Channels' type='ChannelsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                {{block(Channels)}} {{termplural(organize)}} {{block(Channel)}}
                elements. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SensorConfiguration' type='SensorConfigurationType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(SensorConfiguration)}} contains configuration information about
        a {{block(Sensor)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ChannelsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Channels)}} {{termplural(organize)}} {{block(Channel)}}
        elements. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Channel' type='ChannelType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            When {{block(Sensor)}} represents multiple {{termplural(sensing
            element)}}, each {{term(sensing element)}} is represented by a
            {{block(Channel)}} for the {{block(Sensor)}}. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ChannelType'>
    <xs:annotation>
      <xs:documentation>
        When {{block(Sensor)}} represents multiple {{termplural(sensing
        element)}}, each {{term(sensing element)}} is represented by a
        {{block(Channel)}} for the {{block(Sensor)}}. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DescriptionTextType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CalibrationDate' type='CalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the {{term(sensor unit)}} was last calibrated to the
            {{term(sensor element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the {{term(sensor element)}} is next scheduled to be
            calibrated with the {{term(sensor unit)}}. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CalibrationInitials' type='CalibrationInitialsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The initials of the person verifying the validity of the calibration
            data.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='number' type='ChannelNumberType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The channel id
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The channel name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:simpleType name='LimitValueType'>
    <xs:annotation>
      <xs:documentation>
        The limit of a value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='PeakType'>
    <xs:annotation>
      <xs:documentation>
        The peak value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:complexType name='SpecificationsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specifications)}} {{termplural(organize)}}
        {{block(Specification)}} elements for a {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element ref='AbstractSpecification' minOccurs='1' maxOccurs='unbounded'/>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Specifications' type='SpecificationsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specifications)}} {{termplural(organize)}}
        {{block(Specification)}} elements for a {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='OriginatorEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for A reference to the creator of the Specification
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='OriginatorEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        A reference to the creator of the Specification
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MANUFACTURER'>
        <xs:annotation>
          <xs:documentation>
            The manufacturer of a piece of equipment or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USER'>
        <xs:annotation>
          <xs:documentation>
            The owner or implementer of a piece of equipment or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='OriginatorEnumType'>
    <xs:annotation>
      <xs:documentation>
        A reference to the creator of the Specification
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='OriginatorEnumEnum OriginatorEnumExtType'/>
  </xs:simpleType>
  <xs:complexType name='AbstractSpecificationType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        A specification
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The identity of the Specificaiton
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='originator' type='OriginatorEnumType' use='optional' default='MANUFACTURER'>
      <xs:annotation>
        <xs:documentation>
          A reference to the creator of the Specification
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of the spec
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='dataItemIdRef' type='SourceDataItemIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional data item identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='compositionIdRef' type='CompositionIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional composition identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional coordinate system identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractSpecification' type='AbstractSpecificationType'>
    <xs:annotation>
      <xs:documentation>
        A specification
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SpecificationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specification)}} elements define information describing the
        design characteristics for a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractSpecificationType'>
        <xs:all>
          <xs:element name='Maximum' type='MaximumType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with an
                upper limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Minimum' type='MinimumType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with a
                lower limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The target or expected value for this data item.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The upper conformance boundary for a variable. Note to Entry:
                immediate concern or action may be required. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The upper boundary indicating increased concern and supervision
                may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The lower boundary indicating increased concern and supervision
                may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The lower conformance boundary for a variable. Note to Entry:
                immediate concern or action may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Specification' type='SpecificationType' substitutionGroup='AbstractSpecification'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specification)}} elements define information describing the
        design characteristics for a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConstraintType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        The limit of a constraint
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='LimitValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element abstract='true' name='Constraint' type='ConstraintType'>
    <xs:annotation>
      <xs:documentation>
        The limit of a constraint
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaximumType'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with an upper limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Maximum' type='MaximumType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with an upper limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MinimumType'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with a lower limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Minimum' type='MinimumType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with a lower limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='NominalType'>
    <xs:annotation>
      <xs:documentation>
        The target or expected value for this data item.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Nominal' type='NominalType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The target or expected value for this data item.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UpperLimitType'>
    <xs:annotation>
      <xs:documentation>
        The upper conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='UpperLimit' type='UpperLimitType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The upper conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UpperWarningType'>
    <xs:annotation>
      <xs:documentation>
        The upper boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='UpperWarning' type='UpperWarningType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The upper boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LowerWarningType'>
    <xs:annotation>
      <xs:documentation>
        The lower boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LowerWarning' type='LowerWarningType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The lower boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LowerLimitType'>
    <xs:annotation>
      <xs:documentation>
        The lower conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LowerLimit' type='LowerLimitType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The lower conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessSpecificationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessSpecification)}} provides information used to assess the
        conformance of a variable to process requirements. See {{sect(Limits for
        ProcessSpecification)}} for details on the
        {{block(ProcessSpecification)}} model.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractSpecificationType'>
        <xs:all>
          <xs:element name='ControlLimits' type='ControlLimitsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                A set of limits used to indicate whether a process variable is
                stable and in control.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='AlarmLimits' type='AlarmLimitsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                A set of limits used to trigger warning or alarm indicators.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='SpecificationLimits' type='SpecificationLimitsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                A set of limits defining a range of values designating
                acceptable performance for a variable.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessSpecification' type='ProcessSpecificationType' substitutionGroup='AbstractSpecification'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessSpecification)}} provides information used to assess the
        conformance of a variable to process requirements. See {{sect(Limits for
        ProcessSpecification)}} for details on the
        {{block(ProcessSpecification)}} model.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControlLimitsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to indicate whether a process variable is stable
        and in control.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The target or expected value for this data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='AlarmLimitsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to trigger warning or alarm indicators.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='SpecificationLimitsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits defining a range of values designating acceptable
        performance for a variable.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The target or expected value for this data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='RelationshipsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationships)}} {{termplural(organize)}} one or more
        {{block(DataItemRelationship)}} and
        {{block(SpecificationRelationship)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element ref='Relationship' minOccurs='1' maxOccurs='unbounded'/>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Relationships' type='RelationshipsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationships)}} {{termplural(organize)}} one or more
        {{block(DataItemRelationship)}} and
        {{block(SpecificationRelationship)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='RelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The list of possible association types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='PARENT'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a parent
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHILD'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a child
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PEER'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a peer
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DeviceRoleEnumType'>
    <xs:annotation>
      <xs:documentation>
        device relationships
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            a system
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AUXILIARY'>
        <xs:annotation>
          <xs:documentation>
            an auxiliary
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CriticalityEnumType'>
    <xs:annotation>
      <xs:documentation>
        The criticality
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='CRITICAL'>
        <xs:annotation>
          <xs:documentation>
            critical
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NONCRITICAL'>
        <xs:annotation>
          <xs:documentation>
            Not critical
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='RelationshipType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationship)}} describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The relationship identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the relationship
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='RelationshipTypeEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The assciation type
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='criticality' type='CriticalityEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Criticality
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Relationship' type='RelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationship)}} describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRelationship)}} describes the association between two
        components within a piece of equipment that function independently but
        together perform a capability or service within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='RelationshipType'>
        <xs:attribute name='idRef' type='IdRefType' use='required'>
          <xs:annotation>
            <xs:documentation>
              A reference to the device uuid
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ComponentRelationship' type='ComponentRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRelationship)}} describes the association between two
        components within a piece of equipment that function independently but
        together perform a capability or service within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DeviceRelationship)}} describes the association between two
        pieces of equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='RelationshipType'>
        <xs:attribute name='deviceUuidRef' type='UuidType' use='required'>
          <xs:annotation>
            <xs:documentation>
              A reference to the device uuid
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='role' type='DeviceRoleEnumType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The type of relatiship
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='href' type='xlink:hrefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The {{term(URL)}} giving the location of the Solid Model. If not
              present, the model referenced in the
              {{property(solidModelIdRef,SolidModel)}} is used.
              {{property(href,SolidModel)}} is of type `xlink:href` from the W3C
              XLink specification.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute ref='xlink:type' use='optional' fixed='locator'>
          <xs:annotation>
            <xs:documentation>
              The XLink {{property(type)}} attribute **MUST** have a fixed value
              of `locator` as defined in W3C XLink 1.1
              {{cite(https://www.w3.org/TR/xlink11/)}}. If the
              {{property(href)}} attribute is provided, it **MUST** conform to
              the URI syntactic rules as defined in IETF RFC 3986 for Uniform
              Resource Identifiers.
              {{cite(https://www.ietf.org/rfc/rfc3986.txt)}}
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DeviceRelationship' type='DeviceRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        {{block(DeviceRelationship)}} describes the association between two
        pieces of equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='CoordinateSystemIdRefType'>
    <xs:annotation>
      <xs:documentation>
        The reference to the coordinate system
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='CoordinateSystemTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The type of coordinate system
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='WORLD'>
        <xs:annotation>
          <xs:documentation>
            The world
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BASE'>
        <xs:annotation>
          <xs:documentation>
            The base of the manipulator chain
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBJECT'>
        <xs:annotation>
          <xs:documentation>
            The object
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TASK'>
        <xs:annotation>
          <xs:documentation>
            The current task
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MECHANICAL_INTERFACE'>
        <xs:annotation>
          <xs:documentation>
            The last joint in the chain
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL'>
        <xs:annotation>
          <xs:documentation>
            The tool&apos;s coord
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOBILE_PLATFORM'>
        <xs:annotation>
          <xs:documentation>
            The platform
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MACHINE'>
        <xs:annotation>
          <xs:documentation>
            For machine tools, the coordinate system in the work area
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAMERA'>
        <xs:annotation>
          <xs:documentation>
            For machine tools, the coordinate system in the work area
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='CoordinateSystemsType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(CoordinateSystems)}} {{termplural(organize)}}
        {{block(CoordinateSystem)}} elements for a {{block(Component)}} and its
        children.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='CoordinateSystem' type='CoordinateSystemType' minOccurs='1' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                A {{block(CoordinateSystem)}} is a reference system that
                associates a unique set of n parameters with each point in an
                n-dimensional space. {{cite(Ref: ISO 10303-218:2004)}}
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='CoordinateSystems' type='CoordinateSystemsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(CoordinateSystems)}} {{termplural(organize)}}
        {{block(CoordinateSystem)}} elements for a {{block(Component)}} and its
        children.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoordinateSystemType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(CoordinateSystem)}} is a reference system that associates a
        unique set of n parameters with each point in an n-dimensional space.
        {{cite(Ref: ISO 10303-218:2004)}}
      </xs:documentation>
    </xs:annotation>
    <xs:choice minOccurs='0' maxOccurs='1'>
      <xs:element name='Origin' type='OriginType'>
        <xs:annotation>
          <xs:documentation>
            A fixed point from which measurement or motion commences.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Transformation' type='TransformationType'>
        <xs:annotation>
          <xs:documentation>
            The translation of the origin to the position and orientation. At a
            minimum, a {{block(Translation)}} or {{block(Rotation)}} **MUST** be
            given.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:choice>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeName' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='parentIdRef' type='IdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The parent of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='CoordinateSystemTypeEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system type
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='OriginType'>
    <xs:annotation>
      <xs:documentation>
        A fixed point from which measurement or motion commences.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='TransformationType'>
    <xs:annotation>
      <xs:documentation>
        The translation of the origin to the position and orientation. At a
        minimum, a {{block(Translation)}} or {{block(Rotation)}} **MUST** be
        given.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Translation' type='ThreeSpaceValueType'>
        <xs:annotation>
          <xs:documentation>
            An offset applied first
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Rotation' type='ThreeSpaceValueType'>
        <xs:annotation>
          <xs:documentation>
            A three space angular rotation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='MotionTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The types of motion
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='REVOLUTE'>
        <xs:annotation>
          <xs:documentation>
            Rotates around an axis with a fixed range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTINUOUS'>
        <xs:annotation>
          <xs:documentation>
            Revolves around an axis with a continuous range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRISMATIC'>
        <xs:annotation>
          <xs:documentation>
            Sliding linear motion along an axis with a fixed range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIXED'>
        <xs:annotation>
          <xs:documentation>
            The axis does not move.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='ActuationTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The actuation of this component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='DIRECT'>
        <xs:annotation>
          <xs:documentation>
            The movement is initiated by the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VIRTUAL'>
        <xs:annotation>
          <xs:documentation>
            The motion is computed and is used for expressing an imaginary
            movement.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NONE'>
        <xs:annotation>
          <xs:documentation>
            There is no actuation of this Axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='MotionAxisType'>
    <xs:annotation>
      <xs:documentation>
        The unit vector along which the motion occurs
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='MotionDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The description of the motion
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='MotionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Motion)}} defines the movement of the component relative to a
        coordinate system. {{block(Motion)}} specifies the kinematic chain of
        the components.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:sequence>
          <xs:element name='Description' type='MotionDescriptionType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The {{block(Description)}} of the {{block(Definition)}}. See
                {{block(Component)}} {{block(Description)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:choice minOccurs='0' maxOccurs='1'>
            <xs:element name='Origin' type='OriginType'>
              <xs:annotation>
                <xs:documentation>
                  A fixed point from which measurement or motion commences.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
            <xs:element name='Transformation' type='TransformationType'>
              <xs:annotation>
                <xs:documentation>
                  The translation of the origin to the position and orientation.
                  At a minimum, a {{block(Translation)}} or {{block(Rotation)}}
                  **MUST** be given.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:choice>
          <xs:element name='Axis' type='MotionAxisType'>
            <xs:annotation>
              <xs:documentation>
                Description
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:attribute name='id' type='IDType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The coordinate system identifier
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='parentIdRef' type='IdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The parent of the coordinate system
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The identifier of the coordinate system that this motion is
              relative to
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='type' type='MotionTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The motion type
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='actuation' type='ActuationTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The actuation method
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Motion' type='MotionType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Motion)}} defines the movement of the component relative to a
        coordinate system. {{block(Motion)}} specifies the kinematic chain of
        the components.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SolidModelIdRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to another model
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ItemRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to an item in a model
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='SolidModelType'>
    <xs:annotation>
      <xs:documentation>
        {{block(SolidModel)}} is a {{block(Configuration)}} that references a
        file with the three-dimensional geometry of the {{block(Component)}} or
        {{block(Composition)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='Transformation' type='TransformationType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The translation of the origin to the position and orientation.
                At a minimum, a {{block(Translation)}} or {{block(Rotation)}}
                **MUST** be given.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Scale' type='SolidModelScaleType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The {{block(SolidModel)}} {{block(Scale)}} is either a single
                multiplier applied to all three dimensions or a three space
                multiplier given in the X, Y, and Z dimensions in the coordinate
                system used for the {{block(SolidModel)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
        <xs:attribute name='id' type='IDType' use='required'>
          <xs:annotation>
            <xs:documentation>
              the unique identifier for this entity within the MTConnectDevices
              document
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='solidModelIdRef' type='SolidModelIdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The associated model file if an item reference is used
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='href' type='xlink:hrefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The {{term(URL)}} giving the location of the Solid Model. If not
              present, the model referenced in the
              {{property(solidModelIdRef,SolidModel)}} is used.
              {{property(href,SolidModel)}} is of type `xlink:href` from the W3C
              XLink specification.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute ref='xlink:type' use='optional' fixed='locator'>
          <xs:annotation>
            <xs:documentation>
              The XLink {{property(type)}} attribute **MUST** have a fixed value
              of `locator` as defined in W3C XLink 1.1
              {{cite(https://www.w3.org/TR/xlink11/)}}. If the
              {{property(href)}} attribute is provided, it **MUST** conform to
              the URI syntactic rules as defined in IETF RFC 3986 for Uniform
              Resource Identifiers.
              {{cite(https://www.ietf.org/rfc/rfc3986.txt)}}
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='itemRef' type='ItemRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The reference to the item within the model within the related
              geometry. A modelIdRef MUST be given.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='mediaType' type='SolidModelMediaTypeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The format of the referenced document
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The identifier of the coordinate system that this motion is
              relative to
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SolidModel' type='SolidModelType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(SolidModel)}} is a {{block(Configuration)}} that references a
        file with the three-dimensional geometry of the {{block(Component)}} or
        {{block(Composition)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ScaleValueType'>
    <xs:annotation>
      <xs:documentation>
        A three dimensional value &apos;X Y Z&apos; or &apos;A B C&apos;
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='FloatListValueType'>
      <xs:maxLength value='3'/>
      <xs:minLength value='1'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='SolidModelScaleType'>
    <xs:annotation>
      <xs:documentation>
        The unit vector to scale the model
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ScaleValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:simpleType name='SolidModelMediaTypeExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for Solid model media types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='SolidModelMediaTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        Solid model media types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='STEP'>
        <xs:annotation>
          <xs:documentation>
            ISO 10303 STEP AP203 or AP242 format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STL'>
        <xs:annotation>
          <xs:documentation>
            Stereolithography file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GDML'>
        <xs:annotation>
          <xs:documentation>
            Geometry Description Markup Language
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBJ'>
        <xs:annotation>
          <xs:documentation>
            Wavefront OBJ file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COLLADA'>
        <xs:annotation>
          <xs:documentation>
            ISO 17506
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IGES'>
        <xs:annotation>
          <xs:documentation>
            Initial Graphics Exchange Specification
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='3DS'>
        <xs:annotation>
          <xs:documentation>
            Autodesk file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACIS'>
        <xs:annotation>
          <xs:documentation>
            Dassault file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='X_T'>
        <xs:annotation>
          <xs:documentation>
            Parasolid XT Siemens data interchange format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='SolidModelMediaTypeType'>
    <xs:annotation>
      <xs:documentation>
        Solid model media types
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='SolidModelMediaTypeEnum SolidModelMediaTypeExtType'/>
  </xs:simpleType>
  <xs:simpleType name='SampleIntervalType'>
    <xs:annotation>
      <xs:documentation>
        The interval between adjacent sampleing of data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemSampleRateType'>
    <xs:annotation>
      <xs:documentation>
        The frequency a measurement is sampled
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemOptionType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemValueType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemNumericValueType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='SourceComponentIdType'>
    <xs:annotation>
      <xs:documentation>
        An idref to the component id
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='SourceDataItemIdType'>
    <xs:annotation>
      <xs:documentation>
        An idref to the data item id
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ReferenceIdType'>
    <xs:annotation>
      <xs:documentation>
        The item&apos;s reference to the data item or specificatiton
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ComponentNameType'>
    <xs:annotation>
      <xs:documentation>
        The name of a related component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='DiscreteType'>
    <xs:annotation>
      <xs:documentation>
        An discrete event
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:complexType name='DataItemDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The description of a data item, can be free form text or elements
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='FilterValueType'>
    <xs:annotation>
      <xs:documentation>
        The minimum limit on the change in a value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='CategoryType'>
    <xs:annotation>
      <xs:documentation>
        The measurement sampling type
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='EVENT'>
        <xs:annotation>
          <xs:documentation>
            An event represents a change in state occurs at a point in time.
            Note: An event does not occur at predefined frequencies.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SAMPLE'>
        <xs:annotation>
          <xs:documentation>
            A sample is a data point for continuous data items, that is, the
            value of a data item at a point in time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONDITION'>
        <xs:annotation>
          <xs:documentation>
            The condition of the device
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeScaleType'>
    <xs:annotation>
      <xs:documentation>
        The multiplier for the native value. Conversion divides by this value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='RepresentationType'>
    <xs:annotation>
      <xs:documentation>
        A {{property(representation,DataItem)}} specifies the format and
        structure of the information for an {{term(observation)}}. The default
        {{property(representation,DataItem)}} is `VALUE` indicating the format
        as specified in {{citetitle(MTCPart3)}}. A
        {{property(representation,DataItem)}}, other than `VALUE`, will modify
        the element name of the {{term(observation)}} by appending the pascal
        case of the {{property(representation,DataItem)}} as follows:
        \begin{itemize} \item A {{block(DataItem)}} with {{property(type)}}
        `TEMPERATURE` and {{property(representation,DataItem)}} of `TIME_SERIES`
        becomes `TemperatureTimeSeries` \item **DEPRECATED** A
        {{block(DataItem)}} with {{property(type)}} `PART_COUNT` and
        {{property(representation,DataItem)}} of `DISCRETE` becomes
        `PartCountDiscrete` \item A {{block(DataItem)}} with {{property(type)}}
        `VARIABLE` and {{property(representation,DataItem)}} of `DATA_SET`
        becomes `VariableDataSet` \item A {{block(DataItem)}} with
        {{property(type)}} `WORK_OFFSET` and
        {{property(representation,DataItem)}} of `TABLE` becomes
        `WorkOffsetTable` \end{itemize} The following constraints apply to each
        {{property(representation,DataItem)}}: \begin{itemize} \item A
        {{block(DataItem)}} with {{property(representation,DataItem)}}
        `TIME_SERIES` **MUST** have a {{property(category,DataItem)}} `SAMPLE`
        \item \DEPRECATED A {{block(DataItem)}} with
        {{property(representation,DataItem)}} `DISCRETE` **MUST** have a
        {{property(category,DataItem)}} `EVENT` \item A {{block(DataItem)}} with
        {{property(representation,DataItem)}} `DATA_SET` **MUST** have a
        {{property(category,DataItem)}} `EVENT` or `SAMPLE` \item A
        {{block(DataItem)}} with {{property(representation,DataItem)}} `TABLE`
        **MUST** have a {{property(category,DataItem)}} `EVENT` or `SAMPLE`
        \end{itemize} The following sections provide semantic information for
        the {{block(Representation)}} model. !Representation.png! Note: See
        {{sect(Representation Schema Diagrams)}} for XML schema.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='TIME_SERIES'>
        <xs:annotation>
          <xs:documentation>
            A series of sampled data. The data is reported for a specified
            number of samples and each sample is reported with a fixed period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VALUE'>
        <xs:annotation>
          <xs:documentation>
            The measured value of the sample data. If no
            {{property(representation,DataItem)}} is specified for a data item,
            the {{property(representation,DataItem)}} **MUST** be determined to
            be `VALUE`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATA_SET'>
        <xs:annotation>
          <xs:documentation>
            The reported value(s) are represented as a set of
            {{termplural(key-value pair)}}. Each reported value in the
            {{term(Data Set)}} **MUST** have a unique key.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISCRETE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** as a {{property(representation)}} in *MTConnect
            Version. 1.5*. Replaced by the {{property(discrete,DataItem)}}
            attribute of a {{block(DataItem)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TABLE'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Table)}} is a two dimensional set of {{termplural(key-value
            pair)}} where the {{block(Entry)}} represents a row, and the value
            is a set of {{term(key-value pair)}} {{block(Cell)}} elements. The
            {{term(Table)}} follows the same behavior as the {{term(Data Set)}}
            for change tracking, clearing, and history. When an {{block(Entry)}}
            changes, all {{block(Cell)}} elements update as a single unit
            following the behavior of a {{term(Data Set)}}. Note 1 to Entry: It
            is best to use the {{block(Variable)}} {{block(DataItem)}}
            {{property(type)}} if the {{block(Cell)}} elements represent
            multiple semantic types. Each {{block(Entry)}} in the
            {{term(Table)}} **MUST** have a unique key. Each {{block(Cell)}} of
            each {{block(Entry)}} in the {{term(Table)}} **MUST** have a unique
            key. See {{cite(Section 5.6.5)}} of {{citetitle(MTCPart3)}}, for a
            description of {{block(Entry)}} and {{block(Cell)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemFilterEnumType'>
    <xs:annotation>
      <xs:documentation>
        The type of filter
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MINIMUM_DELTA'>
        <xs:annotation>
          <xs:documentation>
            For a `MINIMUM_DELTA` type {{block(Filter)}}, a new value **MUST
            NOT** be reported for a data item unless the measured value has
            changed from the last reported value by at least the delta given as
            the value of this element. The value of {{block(Filter)}} **MUST**
            be an absolute value using the same units as the reported data.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERIOD'>
        <xs:annotation>
          <xs:documentation>
            For a `PERIOD` type {{block(Filter)}}, the data reported for a data
            item is provided on a periodic basis. The `PERIOD` for reporting
            data is defined in the value of the {{block(Filter)}}. The value of
            {{block(Filter)}} **MUST** be an absolute value reported in seconds
            representing the time between reported samples of the value of the
            data item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DataItemsType'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
    <xs:all>
      <xs:element name='DataItem' type='DataItemType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            {{block(DataItem)}} describes a piece of information reported about
            a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DataItemType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItem)}} describes a piece of information reported about a
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Source' type='DataItemSourceType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Source)}} identifies the {{block(Component)}},
            {{block(DataItem)}}, or {{block(Composition)}} representing the area
            of the piece of equipment from which a measured value originates.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Constraints' type='DataItemConstraintsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Constraints)}} {{termplural(organize)}} a set of expected
            values that can be reported for this {{block(DataItem)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Filters' type='FiltersType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Filters)}} {{termplural(organize)}} the {{block(Filter)}}
            elements associated with this {{block(DataItem)}} element. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='InitialValue' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(InitialValue)}} defines the starting value for a data item
            as well as the value to be set for the data item after a reset
            event.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='ResetTrigger' type='DataItemResetValueType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(ResetTrigger)}} identifies the type of event that may cause
            a reset to occur.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Definition' type='DataItemDefinitionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Definition)}} defines the meaning of {{block(Entry)}}
            and {{block(Cell)}} elements associated with the {{block(DataItem)}}
            when the {{property(representation)}} is either {{block(DATA)}} or
            {{block(TABLE)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Relationships' type='DataItemRelationshipsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Relationships)}} {{termplural(organize)}} one or more
            {{block(DataItemRelationship)}} and
            {{block(SpecificationRelationship)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional implementors name of the measurement.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The sub type for the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='statistic' type='DataItemStatisticsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The statistical operation on this data
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units of the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeUnits' type='NativeUnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units as expressed by the machine
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeScale' type='NativeScaleType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units as expressed by the machine
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='category' type='CategoryType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The category of the data item
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystem' type='CoordinateSystemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          A {{block(CoordinateSystem)}} is a reference system that associates a
          unique set of n parameters with each point in an n-dimensional space.
          {{cite(Ref: ISO 10303-218:2004)}}
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system reference to a particular coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional composition identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Used as the default sample rate for waveforms
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='representation' type='RepresentationType' use='optional' default='VALUE'>
      <xs:annotation>
        <xs:documentation>
          A {{property(representation,DataItem)}} specifies the format and
          structure of the information for an {{term(observation)}}. The default
          {{property(representation,DataItem)}} is `VALUE` indicating the format
          as specified in {{citetitle(MTCPart3)}}. A
          {{property(representation,DataItem)}}, other than `VALUE`, will modify
          the element name of the {{term(observation)}} by appending the pascal
          case of the {{property(representation,DataItem)}} as follows:
          \begin{itemize} \item A {{block(DataItem)}} with {{property(type)}}
          `TEMPERATURE` and {{property(representation,DataItem)}} of
          `TIME_SERIES` becomes `TemperatureTimeSeries` \item **DEPRECATED** A
          {{block(DataItem)}} with {{property(type)}} `PART_COUNT` and
          {{property(representation,DataItem)}} of `DISCRETE` becomes
          `PartCountDiscrete` \item A {{block(DataItem)}} with
          {{property(type)}} `VARIABLE` and
          {{property(representation,DataItem)}} of `DATA_SET` becomes
          `VariableDataSet` \item A {{block(DataItem)}} with {{property(type)}}
          `WORK_OFFSET` and {{property(representation,DataItem)}} of `TABLE`
          becomes `WorkOffsetTable` \end{itemize} The following constraints
          apply to each {{property(representation,DataItem)}}: \begin{itemize}
          \item A {{block(DataItem)}} with {{property(representation,DataItem)}}
          `TIME_SERIES` **MUST** have a {{property(category,DataItem)}} `SAMPLE`
          \item \DEPRECATED A {{block(DataItem)}} with
          {{property(representation,DataItem)}} `DISCRETE` **MUST** have a
          {{property(category,DataItem)}} `EVENT` \item A {{block(DataItem)}}
          with {{property(representation,DataItem)}} `DATA_SET` **MUST** have a
          {{property(category,DataItem)}} `EVENT` or `SAMPLE` \item A
          {{block(DataItem)}} with {{property(representation,DataItem)}} `TABLE`
          **MUST** have a {{property(category,DataItem)}} `EVENT` or `SAMPLE`
          \end{itemize} The following sections provide semantic information for
          the {{block(Representation)}} model. !Representation.png! Note: See
          {{sect(Representation Schema Diagrams)}} for XML schema.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='significantDigits' type='SignificantDigitsValueType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The number of significant digits for this data item
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='discrete' type='DiscreteType' use='optional' default='false'>
      <xs:annotation>
        <xs:documentation>
          *MTConnect Version 1.5* replaced {{property(representation)}}
          `DISCRETE` with a {{property(discrete)}} attribute for
          {{block(DataItem)}}. `DISCRETE` \MUST only be used with a
          {{block(DataItem)}} with a {{property(category)}} of `EVENT`. Each
          occurrence of the {{term(observation)}} **MAY** have the same value as
          the previous occurrence, and **MUST NOT** suppress duplicates.
          Examples of `DISCRETE` information as follows: A `PartCount` reporting
          the completion of each part using a 1 to indicate completion of a
          single part, a `Message` that occurs each time a door opens. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='DataItemConstraintsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits for a data item
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:choice minOccurs='0' maxOccurs='1'>
        <xs:sequence minOccurs='1'>
          <xs:element name='Value' type='DataItemValueElementType' minOccurs='1' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                {{property(Value)}} represents a single data value that is
                expected to be reported for a {{block(DataItem)}} element.
                {{property(Value)}} **MUST NOT** be used in conjunction with any
                other {{block(Constraint)}} elements.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:sequence minOccurs='1'>
          <xs:element name='Minimum' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with a
                lower limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Maximum' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with an
                upper limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Nominal' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The target or expected value for this data item.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:choice>
      <xs:element name='Filter' type='DataItemFilterType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='FiltersType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Filters)}} {{termplural(organize)}} the {{block(Filter)}}
        elements associated with this {{block(DataItem)}} element. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Filter' type='DataItemFilterType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DataItemBaseType'>
    <xs:annotation>
      <xs:documentation>
        A starting point for a data item
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='DataItemValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemValueElementType'>
    <xs:annotation>
      <xs:documentation>
        The value element
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='DataItemOptionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemFilterType'>
    <xs:annotation>
      <xs:documentation>
        The filter for the data item
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FilterValueType'>
        <xs:attribute name='type' type='DataItemFilterEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of filter, ABSOLUTE or PERCENT
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemSourceType'>
    <xs:annotation>
      <xs:documentation>
        A native data source
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ItemSourceType'>
        <xs:attribute name='dataItemId' type='SourceDataItemIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The optional data item within the source component that provides
              the underlying data
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='componentId' type='SourceComponentIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component that is collecting the data associated with this
              data item
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The optional composition identifier for the source of this data
              item
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The DataItem Definition
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='EntryDefinitions' type='EntryDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(EntryDefinitions)}} {{termplural(organize)}}
            {{block(EntryDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CellDefinitions' type='CellDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(CellDefinitions)}} {{termplural(organize)}}
            {{block(CellDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='EntryDefinitionsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(EntryDefinitions)}} {{termplural(organize)}}
        {{block(EntryDefinition)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='EntryDefinition' type='EntryDefinitionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The semantic definition of an {{block(Entry)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:attributeGroup name='DefinitionAttrsType'>
    <xs:attribute name='key' type='KeyType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          unique key
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='keyType' type='DataItemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The sub type for the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units of the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:complexType name='EntryDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The semantic definition of an {{block(Entry)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CellDefinitions' type='CellDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(CellDefinitions)}} {{termplural(organize)}}
            {{block(CellDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attributeGroup ref='DefinitionAttrsType'/>
  </xs:complexType>
  <xs:complexType name='CellDefinitionsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(CellDefinitions)}} {{termplural(organize)}}
        {{block(CellDefinition)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='CellDefinition' type='CellDefinitionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The semantic definition of a {{block(Cell)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='CellDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The semantic definition of a {{block(Cell)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attributeGroup ref='DefinitionAttrsType'/>
  </xs:complexType>
  <xs:complexType name='DataItemRelationshipsType'>
    <xs:annotation>
      <xs:documentation>
        Organizes DataItemRelationship and SpecificationRelationship
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='AbstractDataItemRelationship' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='AbstractDataItemRelationshipType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        Common base for data item relationship
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='name' type='NameType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A descriptive name associated with this Relationship
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='idRef' type='ReferenceIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A reference to the related DataItem id.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractDataItemRelationship' type='AbstractDataItemRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        Common base for data item relationship
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='DataItemRelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        How the data items are related
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ATTACHMENT'>
        <xs:annotation>
          <xs:documentation>
            A reference to a DataItem that associates the values with an
            external entity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COORDINATE_SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides the id of the effective Coordinate
            System
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIMIT'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides process limits.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBSERVATION'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides the observed values.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DataItemRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(DataItem)}} described by the {{property(type)}} property.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractDataItemRelationshipType'>
        <xs:attribute name='type' type='DataItemRelationshipTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of either a {{term(Structural Element)}} or a
              {{block(DataItem)}} being measured.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DataItemRelationship' type='DataItemRelationshipType' substitutionGroup='AbstractDataItemRelationship'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(DataItem)}} described by the {{property(type)}} property.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SpecificationRelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        How the data items are related
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='LIMIT'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides process limits.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='SpecificationRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(Specification)}} described by the {{property(type)}} and
        {{property(idRef)}} property.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractDataItemRelationshipType'>
        <xs:attribute name='type' type='SpecificationRelationshipTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of either a {{term(Structural Element)}} or a
              {{block(DataItem)}} being measured.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SpecificationRelationship' type='SpecificationRelationshipType' substitutionGroup='AbstractDataItemRelationship'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(Specification)}} described by the {{property(type)}} and
        {{property(idRef)}} property.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
</xs:schema>