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In the S4S [1] there is: <xs:complexType name="explicitGroup"> [...] <xs:attribute name="name" type="xs:NCName" use="prohibited"/> <xs:attribute name="ref" type="xs:QName" use="prohibited"/> AFAIK the attribute "type" on this attribute prohibitions is superfluous and should be removed. [1] http://www.w3.org/2001/XMLSchema.xsd