UsageType

An enumeration of optional | mandatory to indicate the usage of an attribute or measure.

<xs:simpleType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="UsageType">
  <xs:annotation>
   <xs:documentation>An enumeration of optional | mandatory to indicate the usage of an attribute or measure.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
   <xs:enumeration value="mandatory" />
   <xs:enumeration value="optional" />
  </xs:restriction>
 </xs:simpleType>

owl:withRestrictions (
    [ xsd:enumeration (
        "mandatory"^{xsd:string
        "optional"}xsd:string
    ) ]
)