(ISO specific) The ReducedDatumEnumType enumerates values that describe the reduction of a datum feature to a simpler type, e.g. a sphere to a point (PT), a cone to a straight line (SL), an opposite parallel planes feature to a plane (PL), etc.
<xs:simpleType name="ReducedDatumEnumType"><xs:annotation><xs:documentation>(ISO specific) The ReducedDatumEnumType enumerates values that describe the reduction of a datum feature to a simpler type, e.g. a sphere to a point (PT), a cone to a straight line (SL), an opposite parallel planes feature to a plane (PL), etc.</xs:documentation></xs:annotation><xs:restriction base="xs:NMTOKEN"><xs:enumeration value="PT"/><xs:enumeration value="SL"/><xs:enumeration value="PL"/></xs:restriction></xs:simpleType>