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Let's say I have following XML file: <authors> <author>a1</author> <author>a2</author> <lastmodified>2010</lastmodified> </authors> and an XML schema fragment: <xs:element name="authors" maxOccurs="1"> <xs:complexType> <xs:sequence> <xs:element name="author" maxOccurs="unbounded" type="xs:string"> </xs:element> <xs:element name="lastmodified" type="xs:date" minOccurs="0"/> </xs:sequence> </xs:complexType> <xs:unique name="uniqueAuthor"> <xs:selector xpath="."/> <xs:field xpath="author"/> </xs:unique> </xs:element> What I want is to make a constraint that will not allow two identical author values, but the one above doesn't work that way. What am I doing wrong?
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