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Hello ! I want to define a complex type that represents a parameter. A parameter MUST have a @name A parameter MAY have a @as A parameter has either a @value, or a @abstract A parameter that has a @abstract MUST have @as I've defined this : <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" elementFormDefault="qualified" attributeFormDefault="unqualified" vc:minVersion="1.1"> <xs:element name="data"> <xs:complexType> <xs:sequence maxOccurs="unbounded"> <xs:element name="param" type="TParam"/> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name="TParam"> <xs:attribute name="name" type="xs:string" use="required"/> <xs:attribute name="as" type="xs:string" use="optional"/> <xs:attribute name="value" type="xs:string" use="optional"/> <xs:attribute name="abstract" fixed="true" use="optional" /> <xs:assert test="count(@value | @abstract) eq 1" id="assert1"/> <xs:assert test="if(exists(@abstract)) then exists(@as) else true()" id="assert2"/> </xs:complexType> </xs:schema> And this file : <data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="param.xsd"> <param name="p1" /> <!-- should fail assert1 --> <param name="p2" value="v2"/> <!-- should be valid --> <param name="p3" value="v3" as="xs:string"/> <!-- should be valid --> <param name="p4" as="xs:string" abstract="true"/> <!-- should be valid --> <param name="p5" abstract="true"/> <!-- should fail assert2 --> <param name="p6" abstract="true" value="v6"/> <!-- should fail assert2 --> </data> All param except p4 are invalid. p1 fails assert2 p2 fails assert1 & assert2 p3 fails assert2 p4 is valid p5 fails assert2 p6 fails assert1 & assert2 I do not know what I miss... Any help will be much appreciated ! Best, Christophe
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