Problem with Element::GetAttribute()/HasAttribute()/etc

[osrf-migration]

Original report (archived issue) by Jonathan Bohren (Bitbucket: jbohren).

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If an sdf plugin tag has custom child tags, are those tags allowed to have attributes?

I tried loading some custom tags in a plugin, but the tag attributes don't seem to be loaded. If I put the same information in child tags it does work.

For example, SDF Element::GetAttributeCount() returns 0 for the following child tag of a plugin tag:

<custom foo="somevalue"/>

[scpeters]

custom attributes are now supported in custom elements according to the following proposal

• http://sdformat.org/tutorials?tut=custom_elements_attributes_proposal&cat=pose_semantics_docs&

I have confirmed this by updating an existing test in #1406