<xs:simpleType name="ScaleReferenceEnumType"><xs:annotation><xs:documentation>The ScaleReferenceEnumType enumerates values that describe whether a CMM scale provides an absolute value or a relative value.</xs:documentation></xs:annotation><xs:restriction base="xs:NMTOKEN"><xs:enumeration value="SCALE_ABSOLUTE"/><xs:enumeration value="SCALE_INCREMENTAL"/></xs:restriction></xs:simpleType>