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Message: [QUOTE="Kent B, post: 781837"] Hello people, Sorry if this is the wrong newsgroup. I had a look and couldn't find a more appropriate one for XSD. I have a complex type defined in its own schema as follows: <xsd:complexType name="myType"> <xsd:complexContent> <xsd:extension base="myBaseType"> <xsd:attribute name="parentId" type="xsd:string" use="optional"/> </xsd:extension> </xsd:complexContent> </xsd:complexType> I want to apply a keyRef so that the parentId attribute must refer to a valid ID (defined elsewhere in another schema). However, as far as I can tell, XSD only allows you to specify a keyRef inside an element declaration. But I don't want to declare an element. Does anyone know how I can declare a keyRef without requiring the element? Thanks, Kent [/QUOTE]