<xs:simpleType name="BottomEnumType"><xs:annotation><xs:documentation>The BottomEnumType enumerates values that describe the bottom type for a 3D internal feature type, a feature created by removing material.</xs:documentation></xs:annotation><xs:restriction base="xs:NMTOKEN"><xs:enumeration value="BLIND"/><xs:enumeration value="THROUGH"/><xs:enumeration value="UNDEFINED"/></xs:restriction></xs:simpleType>