<xs:attributeGroup name="declare.attlist" >
  <xs:attribute name="type" type="xs:string"/>
  <xs:attribute name="scope" type="xs:string"/>
  <xs:attribute name="nargs" type="xs:nonNegativeInteger"/>
  <xs:attribute name="occurrence">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="prefix"/>
        <xs:enumeration value="infix"/>
        <xs:enumeration value="function-model"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attributeGroup ref="Definition.attrib"/>
</xs:attributeGroup>