I'm having trouble finding books that describe features like xsd:substitutionGroups and xsd:extensions and xsd:attributeGroup.
Is this because these are features of XML 2.0?
Assuming the answer is yes:
Are there no books out on XML 2.0? I looked my local Barnes and Noble today and could find none. I'm not sure how to search Amazon for XML books that cover XML 2.0.
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