<xs:complexType name="namedAttributeGroup" abstract="true" >
  <xs:complexContent mixed="false">
    <xs:restriction base="xs:attributeGroup">
      <xs:sequence>
        <xs:element minOccurs="0" ref="xs:annotation"/>
        <xs:group ref="xs:attrDecls"/>
      </xs:sequence>
      <xs:attribute name="name" type="xs:NCName" use="required"/>
      <xs:attribute name="ref" use="prohibited"/>
      <xs:anyAttribute namespace="##other" processContents="lax"/>
    </xs:restriction>
  </xs:complexContent>
</xs:complexType>