Hi, We think we have discovered an anomaly in Xerces' interpretation of the XML schema structures specification.
Clause 1.4.3.2.2.1 of http://www.w3.org/TR/xmlschema-1/#cos-ct-extends specifies that when deriving a new complex type by extension from an existing complex type, then: "Both {content type} <http://www.w3.org/TR/xmlschema-1/#content_type>s must be /mixed/ or both must be /element-only/". As demonstrated by the following schema, Xerces-J does not raise an error despite the extension of a mixed complex type by a non-mixed one being illegal. Note that no error is raised regardless of whether the extension type explicitly sets mixed=false or relies on the default value of the mixed attribute (false). <?xml version="1.0" encoding="UTF-8"?> <schema elementFormDefault='qualified' targetNamespace='http://www.example.com/test/' xmlns='http://www.w3.org/2001/XMLSchema' xmlns:eg='http://www.example.com/test/'> <complexType name='mixedType' mixed='true'> <sequence> <any processContents='skip' minOccurs='0' maxOccurs='unbounded' namespace='http://www.w3.org/1999/xhtml' /> </sequence> </complexType> <!-- This extension violates clause 1.4.3.2.2.1 of http://www.w3.org/TR/xmlschema-1/#cos-ct-extends Xerces-J does not raise any errors or warnings when processing this file with full schema checking This is still the case even with mixed=false explicitly set on the complexType below and/or the complexContent Note that the inverse problem applies: move mixed=true from the type above onto this one, and Xerces-J fails to complain (this case is also forbidden) --> <complexType name='extensionType'> <complexContent> <extension base='eg:mixedType'> <attribute use='required' ref='xml:lang' /> </extension> </complexContent> </complexType> </schema> Is this intentional behaviour? Eclipse XSD appears to behave identically, but we are led to believe that other tools regard such schemas as invalid. We are using xerces-j version 2.9.1 Thanks, -- David North, Software Developer, CoreFiling Limited http://www.corefiling.com Phone: +44-1865-203192
