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> Is it possible to track versions of elements in schemas?
> I've tried to add two attributes, ID (xsd:ID) and version
> (xsd:positiveInteger), but then the instance won't validate
> when I add two
> elements with the same ID.
xsd:ID values have to be unique within a document. If you want a more
elaborate constraint (combination of ID and version being unique) you can do
it with an xs:unique constraint in the schema.