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Lets say I have a schema that defines the following XML: <Values> <Add Key="Key1">Value 1</Add> <Add Key="Key2">Value 2</Add> <Add Key="Key3">Value 3</Add> <Add Key="Key4">Value 4</Add> </Values> I would like, at a schema level, to be able to enforce that the values for the Key attribute are unique, i.e. the example above is valid, but the following example would be invalid: <Values> <Add Key="Key1">Value 1</Add> <Add Key="Key2">Value 2</Add> <Add Key="Key2">Value 3</Add> <Add Key="Key3">Value 4</Add> </Values> Notice that there are two Add elements with a Key of Key2 For reference here is the simple schema: <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified"> <xs:element name="Values"> <xs:complexType> <xs:sequence> <xs:element name="Add" maxOccurs="unbounded"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="Key" type="xs:token" use="required"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> I am under the impression that this is not possible at a schema level, however I am all ears.

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