XML XSD Schema - Enforce Unique Attribute Values in Schema

Question

Lets say I have a schema that defines the following XML:

    Value 1
    Value 2&l         


        

Answer 1

More on Michael Kay's answer: If your schema (XSD) declares a namespace, you must include this in your selection.xpath. If you are using Microsoft Visual Studio 2010, you may find a namespace automatically declared.

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