#4 Allow XML in resourceData

[Kal Ahmed]

Allow any arbitrary XML not in the XTM namespace to be
specified as the child of an xtm:resourceData element.

This could be done by simply preserving the XML in the
string reported by DataObject.getData() (currently the
parser drops child XML elements). It might also be
useful to add an attribute to the DataObject interface
which indicates the kind of data held by the
object...perhaps by mime type ?

[Kal Ahmed]

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Postpone to after 0.9.0.