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1. Structures specifies that the simple ur-type defintion must not be used as a base type definition for any user-defined simple types. But, the schema for schemas includes type derivations for the built-in primitive types with base types of anySimpleType. 2. XMLSchema.xsd includes a trailing space in the version. See bullets 1 and 4 in the following email. Henry Thompson's remarks are included: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0033.html
In addition, Jeni Tennison asks where there is a normative constraint for this rule about anySimpleType: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0034.html Henry's response: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0035.html A related mail on "renaming" anySimpleType and "anyType": http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0052.html Resolution: Discussed at the May 23 telecon: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002May/0091.html Henry Thompson to draft erratum: Clarifying that the schema for schemas can derive primitives from anySimpleType, although users cannot. Making the constraint normative, as per Jeni Tennison's point. Erratum incorporated within that of R-54 (bug 2032).