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The following derivation is valid: <xs:complexType name="D"> <xs:complexContent> <xs:restriction base="B"> <xs:anyAttribute namespace="urn:foo" processContents="skip"/> </xs:restriction> </xs:complexContent> </xs:complexType> but D is not a subset of B. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0178.html
Henry's response: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0180.html E1-49 added.