MTConnectDevices_1.5_1.0.xsd

<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns='urn:mtconnect.org:MTConnectDevices:1.5' xmlns:mt='urn:mtconnect.org:MTConnectDevices:1.5' targetNamespace='urn:mtconnect.org:MTConnectDevices:1.5' 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>
        It is the root XML element of an mtconnectdevices response document.
      </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:NMTOKEN'/>
  </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='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='DataItemExtType'>
    <xs:annotation>
      <xs:documentation>
        An extension point for data item types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z]:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatsExtType'>
    <xs:annotation>
      <xs:documentation>
        An extension point for data item statistics types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z]:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The types of measurements available
      </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='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>
            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='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='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 filllevel sample
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR_FORCE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the push or pull introduced by an actuator or
            exerted on an object.
          </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 path component-a vector.
          </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 controller element, or 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 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 measurement of force per unit area exerted by a gas or liquid.
          </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 rotaryvelocity sample
          </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 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='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='VOLTAGE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of electrical potential between two points.
          </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='ACTIVE_AXES'>
        <xs:annotation>
          <xs:documentation>
            The set of axes currently associated with a path or controller
            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 condition category category data items in
            Version 1.1.0.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AVAILABILITY'>
        <xs:annotation>
          <xs:documentation>
            Represents the 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 coupledaxes event 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 linear or 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 controller
            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 state of an interlock function or control logic
            state intended to prevent the associated chuck component from being
            operated.
          </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='CODE'>
        <xs:annotation>
          <xs:documentation>
            DEPRECATED in Version 1.1.
          </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 composition type element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROLLER_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode of the 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='DIRECTION'>
        <xs:annotation>
          <xs:documentation>
            The direction of motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DOOR_STATE'>
        <xs:annotation>
          <xs:documentation>
            The operational state of a door type 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 of whether the end of a piece of bar stock being feed
            by a bar feeder 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 controller.
          </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 operational state of an interface component
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE'>
        <xs:annotation>
          <xs:documentation>
            DEPRECATED in Version 1.4.0.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE_LABEL'>
        <xs:annotation>
          <xs:documentation>
            An optional identifier for a block event of code in a program event.
          </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='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='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_COUNT'>
        <xs:annotation>
          <xs:documentation>
            The count of parts produced.
          </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>
            An identifier of a part or product moving through the manufacturing
            process. The valid data value must be a text string. 
          </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 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 path structural
            element and another path 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
            structural element to allow it to perform its intended function or
            the state of an enabling signal providing permission for the
            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.
          </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
            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. The
            valid data value must be a text string.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_EDIT'>
        <xs:annotation>
          <xs:documentation>
            An indication of the status of the controller components program
            editing mode. On many controls, a program can be edited while
            another program is currently being 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 programedit event when in active value state. The valid data
            value must be a text string.
          </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='ROTARY_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode for a rotary type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_VELOCITY_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The value of a command issued to adjust the programmed velocity for
            a rotary type axis. This command represents a percentage change to
            the velocity calculated by a logic or motion program or set by a
            switch for a rotary type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SERIAL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The serial number associated with a component, asset
            mtconnectassets, or device. The valid data value must be a text
            string.
          </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.The valid data value must
            be a text string.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_ID'>
        <xs:annotation>
          <xs:documentation>
            DEPRECATED in Version 1.2.0. See toolassetid event. 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 controller component to a cutting
            tool when in use by a piece of equipment. The valid data value must
            be a text string.
          </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 path in a 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='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='WORK_OFFSET'>
        <xs:annotation>
          <xs:documentation>
            A reference to the offset variables for a work piece or part
            associated with a path in a controller type component.
          </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. The valid data value must be a text string.
          </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='HARDWARE'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with the hardware subsystem of
            the structural element.
          </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='ASSET_CHANGED'>
        <xs:annotation>
          <xs:documentation>
            The value of the cdata for the event MUST be the assetid of the
            asset that has been added or changed. There will not be a separate
            message for new assets.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_REMOVED'>
        <xs:annotation>
          <xs:documentation>
            The value of the cdata for the event MUST be the assetid of the
            asset that has been removed. The asset will still be visible if
            requested with the includeremoved parameter as described in the
            protocol section. When assets are removed they are not moved to the
            beginning of the most recently modified list. 
          </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='CLOSE_DOOR'>
        <xs:annotation>
          <xs:documentation>
            Service to close a door.
          </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='CLOSE_CHUCK'>
        <xs:annotation>
          <xs:documentation>
            Service to close a chuck.
          </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_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_RETRACT'>
        <xs:annotation>
          <xs:documentation>
            Service to remove or retract material or product.
          </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='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_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            Service to unload a piece of material or product.
          </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='VOLUME_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid volume 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='CAPACITY_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid capacity of an object or container.
          </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_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='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_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_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_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='PROCESS_TIME'>
        <xs:annotation>
          <xs:documentation>
            The time and date associated with an activity or event. processtime
            event MUST be reported in ISO 8601 format.
          </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. datecode event MUST be reported in ISO 8601 format.
          </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. The valid data value MUST
            be an integer.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WAIT_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the reason that execution event is reporting a
            value of wait. The valid data value MUST be poweringup,
            poweringdown, partload, partunload, toolload, toolunload,
            materialload event, materialunload event, secondaryprocess, pausing,
            or resuming.
          </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. The valid data value MUST be present or
            notpresent.
          </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. The valid data value MUST be a NMTOKEN XML
            type.
          </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='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='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. If an Initial Value is not defined, the nesting level
            associated with the highest or initial nesting level of the program
            MUST default to zero (0). The value reported for programnestlevel
            event MUST be an integer.
          </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 program event
            is being executed from the local memory of the controller or from an
            outside source. The valid data value MUST be local or external.
          </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 program event.
          </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='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='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='DataItemEnumTypeEnum DataItemExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTUAL'>
        <xs:annotation>
          <xs:documentation>
            The measured value of the data item type given by a sensor or
            encoder.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAXIMUM'>
        <xs:annotation>
          <xs:documentation>
            Maximum value of a data entity or attribute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINIMUM'>
        <xs:annotation>
          <xs:documentation>
            The minimum value of a data entity or attribute.
          </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='TARGET'>
        <xs:annotation>
          <xs:documentation>
            The desired measure or count for a data item value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMMANDED'>
        <xs:annotation>
          <xs:documentation>
            A value specified by the controller type component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            DEPRECATED: The operators overridden value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAMMED'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation specified by a logic or motion
            program or set by a switch.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RAPID'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation issued to adjust the feedrate
            of a component or composition that is operating in a rapid
            positioning mode.
          </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='STANDARD'>
        <xs:annotation>
          <xs:documentation>
            The standard or original length of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USEABLE'>
        <xs:annotation>
          <xs:documentation>
            The remaining useable length of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROBE'>
        <xs:annotation>
          <xs:documentation>
            The position provided by a measurement probe.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the time from the beginning of production of a
            part or product on a piece of equipment until the time that
            production is complete for that part or product on that piece of
            equipment. This includes the time that the piece of equipment is
            running, producing parts or products, or in the process of producing
            parts.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='A_SCALE'>
        <xs:annotation>
          <xs:documentation>
            A Scale weighting factor. This is the default weighting factor if no
            factor is specified
          </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='C_SCALE'>
        <xs:annotation>
          <xs:documentation>
            C Scale weighting factor
          </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='NO_SCALE'>
        <xs:annotation>
          <xs:documentation>
            No weighting factor on the frequency scale
          </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='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. The valid data value must be active
            value or inactive value. When manualunclamp subtype is active value,
            it is expected that a chuck cannot be unclamped until manualunclamp
            subtype is set to inactive value. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating state of a mechanism represented by a
            composition type component. The operating state indicates whether
            the composition element is activated or disabled. The valid data
            value must be active value or inactive value.
          </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. The mechanism is represented by a composition
            type component. The position information indicates whether the
            composition element is positioned to the right, to the left, or is
            in transition. The valid data value must be right value, left value,
            or transitioning value.
          </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. The
            mechanism is represented by a composition type component. The
            operating state indicates whether the state of the composition
            element is open, closed, or unlatched. The valid data value must be
            open value, unlatched value, or closed value.
          </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 composition type component. The activation state indicates whether
            the composition element is activated or not. The valid data value
            must be on value or off value.
          </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. The mechanism is represented by a composition
            type component. The position information indicates whether the
            composition element is positioned to the top, to the bottom, or is
            in transition. The valid data value must be up value, down value, or
            transitioning value.
          </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. The valid data value
            must be on value or off value. When dryrun subtype is on value, the
            equipment performs all of its normal functions, except no part or
            product is produced. If the equipment has a spindle, spindle
            operation is suspended.
          </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. The valid data value must be on
            value or off value. When machineaxislock subtype is on value,
            program execution continues normally, but no equipment motion occurs
            
          </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. The valid data value must be on
            value or off value. The program execution is stopped after a
            specific program block is executed when optionalstop subtype is on
            value. In the case of a G-Code program, a program block event
            containing a M01 code designates the command for an optionalstop
            subtype. execution event must change to optionalstop subtype after a
            program block specifying an optional stop is executed and the
            optionalstop subtype selection is on value.
          </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. The valid data value must be on
            value or off value. Program execution is paused after each block
            event of code is executed when singleblock subtype is on value. When
            singleblock subtype is on value, execution event must change to
            interrupted value after completion of each block event of code. 
          </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. The valid data value must be on
            value or off value. Program execution is paused when a command is
            executed requesting a cutting tool to be changed. execution event
            must change to interrupted value after completion of the command
            requesting a cutting tool to be changed and toolchangestop subtype
            is on value.
          </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='ROTARY'>
        <xs:annotation>
          <xs:documentation>
            The rotational direction of a rotary motion using the right hand
            rule convention. The valid data value must be clockwise value or
            counterclockwise value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AUXILIARY'>
        <xs:annotation>
          <xs:documentation>
            When multiple locations on a piece of bar stock are referenced as
            the indication for the endofbar event, the additional location(s)
            must be designated as auxiliary subtype indication(s) for the
            endofbar event. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRIMARY'>
        <xs:annotation>
          <xs:documentation>
            Specific applications MAY reference one or more locations on a piece
            of bar stock as the indication for the endofbar event. The main or
            most important location must be designated as the primary subtype
            indication for the endofbar event. If no subtype is specified,
            primary subtype must be the default endofbar event indication.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DELAY'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment waiting for an event or an action to occur.
          </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='OPERATING'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment are powered or performing any activity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWERED'>
        <xs:annotation>
          <xs:documentation>
            Primary power is applied to the piece of equipment and, as a
            minimum, the controller or logic portion of the piece of equipment
            is powered and functioning or components that are required to remain
            on are powered.
          </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='LEEB'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the elasticity of a surface.
          </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='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='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='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='ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            The position of a block of program code relative to the beginning of
            the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCREMENTAL'>
        <xs:annotation>
          <xs:documentation>
            The position of a block of program code relative to the occurrence
            of the last linelabel event encountered in the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALL'>
        <xs:annotation>
          <xs:documentation>
            The count of all the parts produced. If the subtype is not given,
            this is the default.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BAD'>
        <xs:annotation>
          <xs:documentation>
            Indicates the count of incorrect parts produced.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GOOD'>
        <xs:annotation>
          <xs:documentation>
            Indicates the count of correct parts made.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REMAINING'>
        <xs:annotation>
          <xs:documentation>
            Remaining measure of an object or an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOG'>
        <xs:annotation>
          <xs:documentation>
            The feedrate specified by a logic or motion program, by a pre-set
            value, or set by a switch as the feedrate for the axes. 
          </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='LINE'>
        <xs:annotation>
          <xs:documentation>
            The state of the power source for the structural element.
          </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='LENGTH'>
        <xs:annotation>
          <xs:documentation>
            A reference to a length type tool offset variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            Action related to maintenance on the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATOR'>
        <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='SET_UP'>
        <xs:annotation>
          <xs:documentation>
            The identifier of the person currently responsible for preparing 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='COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            Completion of an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONSUMED'>
        <xs:annotation>
          <xs:documentation>
            The amount of bulk material consumed from an object or container
            during a manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='START'>
        <xs:annotation>
          <xs:documentation>
            The time and date associated with the beginning of an activity or
            event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TARGET_COMPLETION'>
        <xs:annotation>
          <xs:documentation>
            The projected time and date associated with the end or completion of
            an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUFACTURE'>
        <xs:annotation>
          <xs:documentation>
            The time and date code relating to the production of a material or
            other physical item.
          </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='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='MAIN'>
        <xs:annotation>
          <xs:documentation>
            The identity of the primary logic or motion program currently being
            executed. It is the starting nest level in a call structure and may
            contain calls to sub programs.
          </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='DataItemSubEnumTypeEnum DataItemExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsTypeEnum'>
    <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>
            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 value of a data entity or attribute.
          </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>
            The minimum value of a data entity or attribute.
          </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='DataItemStatisticsTypeEnum DataItemStatsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='UnitsExtType'>
    <xs:annotation>
      <xs:documentation>
        An extension point for data item types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='x:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The unit of measurement for the reported value of the data item.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <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='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='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/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/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/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='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='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='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='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='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </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='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsType'>
    <xs:annotation>
      <xs:documentation>
        The unit of measurement for the reported value of the data item.
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='UnitsTypeEnum UnitsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The native units of measurement for the reported value of the data item.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <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='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='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/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/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/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='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='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='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='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='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </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='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </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='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_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='INCH_POUND'>
        <xs:annotation>
          <xs:documentation>
            A measure of torque in inch pounds.
          </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='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>
            Velocity in radians per second
          </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='MINUTE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time in minutes
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsType'>
    <xs:annotation>
      <xs:documentation>
        The native units of measurement for the reported value of the data item.
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='NativeUnitsTypeEnum UnitsExtType'/>
  </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>
        An extension point for reset types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z]:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            Action related to maintenance on the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTION_COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            The value of the data entity 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 data entity 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 data entity 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 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='MONTH'>
        <xs:annotation>
          <xs:documentation>
            The value of the data entity 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 data entity 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 data entity 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 data entity 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='DataItemResetValueTypeEnum DataItemResetValueExtType'/>
  </xs:simpleType>
  <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>
        An XML container in an mtconnect response document that provides
        information from an agent defining version information, storage
        capacity, and parameters associated with the data management within the
        agent.
      </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:attribute name='version' type='VersionType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The protocol version number.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='creationTime' type='CreationTimeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The time the response was created.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='testIndicator' type='TestIndicatorType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Optional flag that indicates the system is operating in test mode.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='instanceId' type='InstanceIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A number indicating which invocation of the agent. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sender' type='SenderType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The agent identification information. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='bufferSize' type='BufferSizeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A value representing the maximum number of data entity that MAY be
          retained in the agent that published the response document at any
          point in time.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='assetBufferSize' type='AssetBufferSizeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The maximum number of mtconnect asset that will be retained by the
          agent.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='assetCount' type='AssetCountAttrType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The total number of mtconnect asset in anagent.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='MTConnectDevicesType'>
    <xs:annotation>
      <xs:documentation>
        It is the root XML element of an mtconnectdevices response document.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Header' type='HeaderType'>
        <xs:annotation>
          <xs:documentation>
            An XML container in an mtconnect response document that provides
            information from an agent defining version information, storage
            capacity, and parameters associated with the data management within
            the agent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Devices' type='DevicesType'>
        <xs:annotation>
          <xs:documentation>
            The first, or highest level, structural element in a
            mtconnectdevices document.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </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>
        The first, or highest level, structural element in a mtconnectdevices
        document.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Device' type='DeviceType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The primary container element for each piece of equipment. device is
            organized within the devices container.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='ComponentType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        An abstract XML element. Replaced in the XML document by types of
        component elements representing physical parts and logical functions of
        a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML element that can contain any descriptive content.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Configuration' type='ComponentConfigurationType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML element that contains technical information about a piece of
            equipment describing its physical layout or functional
            characteristics.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='DataItems' type='DataItemsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML container consisting of one or more types of dataitem XML
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Components' type='ComponentsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML container that consists of one or more types of component XML
            elements. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Compositions' type='CompositionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML container consisting of one or more types of composition XML
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='References' type='ReferencesType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML container consisting of one or more types of reference XML
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
    <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 common name normally associated with a piece of equipment or an
          element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleInterval' type='SampleIntervalType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          An optional attribute that is an indication provided by a piece of
          equipment describing the interval in milliseconds between the
          completion of the reading of the data associated with the device
          element until the beginning of the next sampling of that data.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The rate at which successive samples of a data item are recorded by a
          piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Component' type='ComponentType'>
    <xs:annotation>
      <xs:documentation>
        An abstract XML element. Replaced in the XML document by types of
        component elements representing physical parts and logical functions 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:sequence>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            A placeholder for an XML element.
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:sequence>
    <xs:attribute name='manufacturer' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of the manufacturer of the physical or logical part of a
          piece of equipment represented by an XML element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='model' type='ModelType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The model description of the physical part or logical function of a
          piece of equipment represented by this XML element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='serialNumber' type='SerialNumberAttrType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The serial number associated with a piece of equipment. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='station' type='StationType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The station where the physical part or logical function of a piece of
          equipment is located when it is part of a manufacturing unit or cell
          with multiple stations.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='AbstractConfigurationType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        It is an abstract type XML element. It will never appear in the XML
        document representing a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractConfiguration' type='AbstractConfigurationType'>
    <xs:annotation>
      <xs:documentation>
        It is an abstract type XML element. It will never appear in the XML
        document representing a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentConfigurationType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The configuration data associated with this component. For example,
        sensors may use 1451.5 or TEDS
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref='AbstractConfiguration' minOccurs='1' maxOccurs='unbounded'/>
    </xs:sequence>
  </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 unique identifier for an XML element.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The name of an element or a piece of equipment.
            </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>
        An XML container that consists of one or more types of component XML
        elements. 
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref='Component' minOccurs='1' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='DeviceType'>
    <xs:annotation>
      <xs:documentation>
        The primary container element for each piece of equipment. device is
        organized within the devices container.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ComponentType'>
        <xs:attribute name='iso841Class' type='Iso841ClassType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              DEPRECATED in MTConnect Version 1.1.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='uuid' type='UuidType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The unique identifier for an XML element.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The name of an element or a piece of equipment.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Device' type='DeviceType' substitutionGroup='Component'>
    <xs:annotation>
      <xs:documentation>
        The primary container element for each piece of equipment. device is
        organized within the devices container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ActuatorType'>
    <xs:annotation>
      <xs:documentation>
        Redefined as a piece of equipment with the ability to be represented as
        a lower level component of a parent component element or as a
        composition element. See actuator type
      </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>
        Redefined as a piece of equipment with the ability to be represented as
        a lower level component of a parent component element or as a
        composition element. See actuator type
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AuxiliariesType'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing functional sub-systems that provide 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='Auxiliaries' type='AuxiliariesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing functional sub-systems that provide 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='AxesType'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize the structural element of a piece of
        equipment that perform linear or rotational motion.
      </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>
        An XML container used to organize the structural element of a piece of
        equipment that perform linear or rotational motion.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ElectricType'>
    <xs:annotation>
      <xs:documentation>
        electric is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Electric' type='ElectricType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        electric is an XML container that 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='LoaderType'>
    <xs:annotation>
      <xs:documentation>
        loader is an XML container that 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='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Loader' type='LoaderType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        loader is an XML container that 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='WasteDisposalType'>
    <xs:annotation>
      <xs:documentation>
        wastedisposal is an XML container that 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='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WasteDisposal' type='WasteDisposalType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        wastedisposal is an XML container that 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='ToolingDeliveryType'>
    <xs:annotation>
      <xs:documentation>
        toolingdelivery is an XML container that 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='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolingDelivery' type='ToolingDeliveryType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        toolingdelivery is an XML container that 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='EnvironmentalType'>
    <xs:annotation>
      <xs:documentation>
        environmental is an XML container that 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='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Environmental' type='EnvironmentalType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        environmental is an XML container that 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='BarFeederType'>
    <xs:annotation>
      <xs:documentation>
        barfeeder is an XML container that 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='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='BarFeeder' type='BarFeederType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        barfeeder is an XML container that 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='InterfaceType'>
    <xs:annotation>
      <xs:documentation>
        Each interface component contains data entity available from the piece
        of equipment that may be needed to coordinate activities with associated
        pieces of equipment.
      </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>
        Each interface component contains data entity available from the piece
        of equipment that may be needed to coordinate activities with associated
        pieces of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='InterfacesType'>
    <xs:annotation>
      <xs:documentation>
        An XML container that organizes information used to coordinate actions
        and activities between pieces of equipment that communicate information
        between each other. 
      </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>
        An XML container that organizes information used to coordinate actions
        and activities between pieces of equipment that communicate information
        between each other. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinearType'>
    <xs:annotation>
      <xs:documentation>
        A 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='AxesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Linear' type='LinearType' substitutionGroup='Axes'>
    <xs:annotation>
      <xs:documentation>
        A 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='PathType'>
    <xs:annotation>
      <xs:documentation>
        path is an XML container that represents the information for an
        independent operation or function within a controller.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ControllerType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Path' type='PathType' substitutionGroup='Controller'>
    <xs:annotation>
      <xs:documentation>
        path is an XML container that represents the information for an
        independent operation or function within a controller.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResourcesType'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing types of items, materials, and personnel that support the
        operation of a piece of equipment or work to be performed at a location.
        resources 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='Resources' type='ResourcesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing types of items, materials, and personnel that support the
        operation of a piece of equipment or work to be performed at a location.
        resources 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='PowerType'>
    <xs:annotation>
      <xs:documentation>
        DEPRECATED: power was DEPRECATED in MTConnect Version 1.1 and was
        replaced by the data entity called availability event.
      </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>
        DEPRECATED: power was DEPRECATED in MTConnect Version 1.1 and was
        replaced by the data entity called availability event.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialsType'>
    <xs:annotation>
      <xs:documentation>
        materials is an XML container that 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='ResourcesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Materials' type='MaterialsType' substitutionGroup='Resources'>
    <xs:annotation>
      <xs:documentation>
        materials is an XML container that 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='StockType'>
    <xs:annotation>
      <xs:documentation>
        stock is an XML container that 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='MaterialsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Stock' type='StockType' substitutionGroup='Materials'>
    <xs:annotation>
      <xs:documentation>
        stock is an XML container that 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='PersonnelType'>
    <xs:annotation>
      <xs:documentation>
        personnel is an XML container that 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='ResourcesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Personnel' type='PersonnelType' substitutionGroup='Resources'>
    <xs:annotation>
      <xs:documentation>
        personnel is an XML container that 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='RotaryType'>
    <xs:annotation>
      <xs:documentation>
        A 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='AxesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Rotary' type='RotaryType' substitutionGroup='Axes'>
    <xs:annotation>
      <xs:documentation>
        A 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>
        The sensor unit is modeled as a lower level component called sensor.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliariesType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Sensor' type='SensorType' substitutionGroup='Auxiliaries'>
    <xs:annotation>
      <xs:documentation>
        The sensor unit is modeled as a lower level component called sensor.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SystemsType'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing the major sub-systems 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='Systems' type='SystemsType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information for lower level elements
        representing the major sub-systems that are permanently integrated into
        a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControllerType'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information about an intelligent or
        computational function within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Controller' type='ControllerType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An XML container used to organize information about an intelligent or
        computational function within 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='RotaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Chuck' type='ChuckType' substitutionGroup='Rotary'>
    <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='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='HydraulicType'>
    <xs:annotation>
      <xs:documentation>
        hydraulic is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Hydraulic' type='HydraulicType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        hydraulic is an XML container that 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='PneumaticType'>
    <xs:annotation>
      <xs:documentation>
        pneumatic is an XML container that represents the information for a
        system comprised of all the parts involved in moving and distributing
        pressurized gas throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Pneumatic' type='PneumaticType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        pneumatic is an XML container that represents the information for a
        system comprised of all the parts involved in moving and distributing
        pressurized gas throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoolantType'>
    <xs:annotation>
      <xs:documentation>
        coolant is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Coolant' type='CoolantType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        coolant is an XML container that 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='LubricationType'>
    <xs:annotation>
      <xs:documentation>
        lubrication is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Lubrication' type='LubricationType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        lubrication is an XML container that 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='EnclosureType'>
    <xs:annotation>
      <xs:documentation>
        enclosure is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Enclosure' type='EnclosureType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        enclosure is an XML container that 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='ProtectiveType'>
    <xs:annotation>
      <xs:documentation>
        Protective is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Protective' type='ProtectiveType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        Protective is an XML container that 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='ProcessPowerType'>
    <xs:annotation>
      <xs:documentation>
        processpower is an XML container that represents the information for a
        power source associated with a piece of equipment that supplies energy
        to the manufacturing process separate from the electric system.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessPower' type='ProcessPowerType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        processpower is an XML container that represents the information for a
        power source associated with a piece of equipment that supplies energy
        to the manufacturing process separate from the electric system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FeederType'>
    <xs:annotation>
      <xs:documentation>
        feeder is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Feeder' type='FeederType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        feeder is an XML container that 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='DielectricType'>
    <xs:annotation>
      <xs:documentation>
        dielectric is an XML container that 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='SystemsType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Dielectric' type='DielectricType' substitutionGroup='Systems'>
    <xs:annotation>
      <xs:documentation>
        dielectric is an XML container that 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='DepositionType'>
    <xs:annotation>
      <xs:documentation>
        deposition is an XML container that 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='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Deposition' type='DepositionType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        deposition is an XML container that 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='EndEffectorType'>
    <xs:annotation>
      <xs:documentation>
        endeffector is an XML container that 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='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='EndEffector' type='EndEffectorType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        endeffector is an XML container that 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='CompositionsType'>
    <xs:annotation>
      <xs:documentation>
        An XML container consisting of one or more types of composition XML
        elements.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Composition' type='CompositionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            An XML element used to describe the lowest level structural building
            blocks contained within a component element.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:simpleType name='CompositionTypeExtType'>
    <xs:annotation>
      <xs:documentation>
        An extension point for Composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z]:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CompositionEnumTypeTypeEnum'>
    <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='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='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='SENSING_ELEMENT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that provides a signal or measured value.
          </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='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='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='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='VAT'>
        <xs:annotation>
          <xs:documentation>
            A container for liquid or powdered materials
          </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='EXPOSURE_UNIT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for emitting a type of radiation
          </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='SPREADER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for flattening or spreading materials
          </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: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='CompositionEnumTypeTypeEnum CompositionTypeExtType'/>
  </xs:simpleType>
  <xs:complexType name='CompositionType'>
    <xs:annotation>
      <xs:documentation>
        An XML element used to describe the lowest level structural building
        blocks contained within a component element.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML element that can contain any descriptive content.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
    <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 unique identifier for an XML element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of an element or a piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='CompositionEnumTypeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of either a structural element or a dataitem being measured.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </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>
        An element that can contain descriptive content defining the
        configuration information for sensor.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:sequence>
          <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 sensor unit was last calibrated. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                Date upon which the sensor unit is next scheduled to be
                calibrated. 
              </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>
                When sensor represents multiple sensing element, each sensing
                element is represented by a channel for the sensor. channels is
                an XML container used to organize information for the sensing
                element. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SensorConfiguration' type='SensorConfigurationType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        An element that can contain descriptive content defining the
        configuration information for sensor.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ChannelsType'>
    <xs:annotation>
      <xs:documentation>
        When sensor represents multiple sensing element, each sensing element is
        represented by a channel for the sensor. channels is an XML container
        used to organize information for the sensing element. 
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Channel' type='ChannelType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            channel represents each sensing element connected to a sensor unit.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='ChannelType'>
    <xs:annotation>
      <xs:documentation>
        channel represents each sensing element connected to a sensor unit.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Description' type='DescriptionTextType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML element that can contain any descriptive content.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CalibrationDate' type='CalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the sensor unit was last calibrated. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the sensor unit is next scheduled to be calibrated. 
          </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:sequence>
    <xs:attribute name='number' type='ChannelNumberType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A unique identifier that will only refer to a specific sensing
          element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of an element or a piece of equipment.
        </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>
        An XML container consisting of one or more types of reference XML
        elements.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref='Reference' minOccurs='1' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='ReferenceType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        reference is a pointer to information that is associated with another
        structural element defined elsewhere in the XML document for a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='idRef' type='IdRefType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A pointer to the id attribute of an element that contains the
          information to be associated with this XML element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of an element or a piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Reference' type='ReferenceType'>
    <xs:annotation>
      <xs:documentation>
        reference is a pointer to information that is associated with another
        structural element defined elsewhere in the XML document for a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DataItemRefType'>
    <xs:annotation>
      <xs:documentation>
        dataitemref XML element is a pointer to a data entity associated with
        another structural element defined elsewhere in the XML document for a
        piece of equipment.
      </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>
        dataitemref XML element is a pointer to a data entity associated with
        another structural element defined elsewhere in the XML document for a
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRefType'>
    <xs:annotation>
      <xs:documentation>
        componentref XML element is a pointer to all of the information
        associated with another structural element defined elsewhere in the XML
        document for a piece of equipment. 
      </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>
        componentref XML element is a pointer to all of the information
        associated with another structural element defined elsewhere in the XML
        document for a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RelationshipsType'>
    <xs:annotation>
      <xs:documentation>
        An XML container that organizes information defining the affiliation
        between pieces of equipment that function independently but together
        perform a manufacturing operation. It may also define the affiliation
        between components within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:sequence>
          <xs:element ref='Relationship' minOccurs='1' maxOccurs='unbounded'/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Relationships' type='RelationshipsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        An XML container that organizes information defining the affiliation
        between pieces of equipment that function independently but together
        perform a manufacturing operation. It may also define the affiliation
        between components within a piece of equipment.
      </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='NON_CRITICAL'>
        <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>
        An XML element that describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation. It may also be used to define the association
        between two components within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <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='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of an element or a piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='RelationshipTypeEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of either a structural element or a dataitem being measured.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='criticality' type='CriticalityEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Defines whether the services or functions provided by the associated
          piece of equipment is required for the operation of this piece of
          equipment. criticality is an optional attribute. The value provided
          for criticality MUST be one of the following values: tab critical: The
          services or functions provided by the associated piece of equipment is
          required for the operation of this piece of equipment. tab
          noncritical: The services or functions provided by the associated
          piece of equipment is not required for the operation of this piece of
          equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Relationship' type='RelationshipType'>
    <xs:annotation>
      <xs:documentation>
        An XML element that describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation. It may also be used to define the association
        between two components within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        It describes the association between two components within a pieces 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 pointer to the id attribute of an element that contains the
              information to be associated with this XML element.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ComponentRelationship' type='ComponentRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        It describes the association between two components within a pieces 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>
        It 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 associated piece of equipment. The value
              provided for deviceuuidref MUST be the value provided for the uuid
              attribute of the device element of the associated piece of
              equipment. deviceuuidref is a required attribute. An NMTOKEN XML
              type.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='role' type='DeviceRoleEnumType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              Defines the services or capabilities that the referenced piece of
              equipment provides relative to this piece of equipment. role is an
              optional attribute. The value provided for role MUST be one of the
              following values: tab system condition: The associated piece of
              equipment performs the functions of a System for this piece of
              equipment. In MTConnect, System provide utility type services to
              support the operation of a piece of equipment and these services
              are required for the operation of a piece of equipment. tab
              auxiliary subtype: The associated piece of equipment performs the
              functions as an Auxiliary for this piece of equipment. In
              MTConnect, Auxiliary extends the capabilities of a piece of
              equipment, but is not required for the equipment to function.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='href' type='xlink:hrefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              A URI identifying the agent that is publishing information for the
              associated piece of equipment. href MUST also include the UUID for
              that specific piece of equipment.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute ref='xlink:type' use='optional' fixed='locator'>
          <xs:annotation>
            <xs:documentation>
              The XLink type attribute MUST have a fixed value of locator as
              defined in W3C XLink 1.1 https://www.w3.org/TR/xlink11/ section
              5.4 Locator Attribute (href).
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DeviceRelationship' type='DeviceRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        It 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='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='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='CoordinateSystemIdType'>
    <xs:annotation>
      <xs:documentation>
        The id reference for the coordinate system associated with this data
        item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </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: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>
        Specifies the kind of information provided by a data item. 
      </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>
        Description of a means to interpret data consisting of multiple data
        points or samples reported as a single value. representation is an
        optional attribute. representation will define a unique format for each
        set of data. representation for timeseries representation, discrete
        representation, and value representation are defined in MTCPart2 Section
        7.2.2.12. If representation is not specified, it MUST be determined to
        be value representation.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='DISCRETE (normalfont DEPRECATED in Version 1.5)'>
        <xs:annotation>
          <xs:documentation>
            A data entity where each discrete occurrence of the data may have
            the same value as the previous occurrence of the data.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TIME_SERIES'>
        <xs:annotation>
          <xs:documentation>
            A series of sampled data. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VALUE'>
        <xs:annotation>
          <xs:documentation>
            The measured value of the sample data.
          </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 key-value pair.
            Each reported value in the data set MUST have a unique key. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATA_SET'>
        <xs:annotation>
          <xs:documentation>
            A set of entries
          </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 filter minimumdelta, a new value MUSTNOT 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 cdata of this element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERIOD'>
        <xs:annotation>
          <xs:documentation>
            The data reported for a data item with this filter is provided on a
            periodic basis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DataItemsType'>
    <xs:annotation>
      <xs:documentation>
        An XML container consisting of one or more types of dataitem XML
        elements.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='DataItem' type='DataItemType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            data entity describing a piece of information reported about a piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='DataItemType'>
    <xs:annotation>
      <xs:documentation>
        data entity describing a piece of information reported about a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Source' type='DataItemSourceType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            source identifies the structural element 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>
            constraints is an optional container that provides a set of expected
            values that can be reported for this dataitem.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Filters' type='FiltersType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An XML container consisting of one or more types of filter XML
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='InitialValue' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            initialvalue is an optional XML element that 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>
            resettrigger is an optional XML element that identifies the type of
            event that may cause a reset to occur. It is additional information
            regarding the meaning of the data that establishes an understanding
            of the time frame that the data represents so that the data may be
            correctly understood by a client software application.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of an element or a piece of equipment.
        </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 either a structural element or a dataitem being measured.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          A sub-categorization of the data item type.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='statistic' type='DataItemStatisticsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Describes the type of statistical calculation performed on a series of
          data samples to provide the reported data value.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The unit of measurement for the reported value of the data item.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeUnits' type='NativeUnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The native units of measurement for the reported value of the data
          item.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeScale' type='NativeScaleType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          nativescale MAY be used to convert the reported value to represent the
          original measured value.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='category' type='CategoryType' use='required'>
      <xs:annotation>
        <xs:documentation>
          Specifies the kind of information provided by a data item. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystem' type='CoordinateSystemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          For measured values relative to a coordinate system like position
          sample, the coordinate system being used may be reported.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystemId' type='CoordinateSystemIdType' 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 identifier attribute of the composition element that the reported
          data is most closely associated. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The rate at which successive samples of a data item are recorded by a
          piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='representation' type='RepresentationType' use='optional' default='VALUE'>
      <xs:annotation>
        <xs:documentation>
          Description of a means to interpret data consisting of multiple data
          points or samples reported as a single value. representation is an
          optional attribute. representation will define a unique format for
          each set of data. representation for timeseries representation,
          discrete representation, and value representation are defined in
          MTCPart2 Section 7.2.2.12. If representation is not specified, it MUST
          be determined to be value representation.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='significantDigits' type='SignificantDigitsValueType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The number of significant digits in the reported value.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='discrete' type='DiscreteType' use='optional' default='false'>
      <xs:annotation>
        <xs:documentation>
          An indication signifying whether each value reported for the data
          entity is significant and whether duplicate values are to be
          suppressed. The value defined MUST be either true removed or false
          removed - an XML boolean type. true removed indicates that each update
          to the data entity&apos;s value is significant and duplicate values
          MUSTNOT be suppressed. false removed indicates that duplicated values
          MUST be suppressed. If a value is not defined for discrete, the
          default value MUST be false removed.
        </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>
                value represents a single data value that is expected to be
                reported for a dataitem element. 
              </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>
                The lower limit of data reported for a data item.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Maximum' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The upper limit of data reported for a data item.
              </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>
            filter provides a means to control when an agent records updated
            information for a data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='FiltersType'>
    <xs:annotation>
      <xs:documentation>
        An XML container consisting of one or more types of filter XML elements.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='Filter' type='DataItemFilterType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            filter provides a means to control when an agent records updated
            information for a data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </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 either a structural element or a dataitem being
              measured.
            </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 identifier attribute of the dataitem that represents the
              originally measured value of the data referenced by this data
              item.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='componentId' type='SourceComponentIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The identifier attribute of the component element that represents
              the physical part of a piece of equipment where the data
              represented by the dataitem element originated.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The identifier attribute of the composition element that the
              reported data is most closely associated. 
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:schema>