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This issue was originally reported by Asir Vedamuthu / XML Schema WG. This was originally R-156 (http://www.w3.org/2001/05/xmlschema-rec-comments.html#pfiMixedSimple). Consider: <complexType name="something" mixed="true"> <simpleContent> <restriction base="string"> </restriction> </simpleContent> </complexType> This is a unique combination, a complex type with simple content and mixed content type. I believe that this combination is valid per XML Schema 1.0 REC. Personally, I believe that this combination is invalid and hope this will be ruled out explicitly. See the following for more info: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0127.html Response from Henry: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0141.html The WG discussed this issue at the Sept. 13 telecon, and agreed to add a "warning" about this now (2nd edition), with the intent that constraints will be added to 1.1.
The Working Group discussed this issue on 22 September 2006 and concluded that yes, we should make the combination described invalid. The editors are to prepare a wording proposal in line with the suggestions made in the email thread referred to in the description.
A proposal to resolve this issue has been placed at http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.cleanup-1.200610.html (member-only link) for review and action by the WG.
The proposal mentioned in comment #2 has been approved by the WG and integrated into the status-quo text of the spec. It should be included in due course in the next public working draft.