<xs:simpleType name="PrecedenceEnumType"><xs:annotation><xs:documentation>The PrecedenceEnumType enumerates values that describe the precedence of a datum in a feature control frame or compound datum.</xs:documentation></xs:annotation><xs:restriction base="xs:NMTOKEN"><xs:enumeration value="PRIMARY"/><xs:enumeration value="SECONDARY"/><xs:enumeration value="TERTIARY"/><xs:enumeration value="QUATERNARY"/><xs:enumeration value="QUINARY"/><xs:enumeration value="SENARY"/></xs:restriction></xs:simpleType>