<xs:simpleType name="MaterialModifierEnumType">
  <xs:annotation>
    <xs:documentation>The MaterialModifierEnumType enumerates values that describe a material condition or material boundary modifier for a tolerance zone or a datum reference.</xs:documentation>
    <xs:documentation>ASME Y14.5 - 2009 Sections 1.3.38, 1.3.39, 1.3.48</xs:documentation>
    <xs:documentation>ISO 2692 specific: LEAST_RPR and MAXIMUM_RPR represent the least and maximum material symbols respectively when appended with the reciprocity requirement symbol, i.e., (L)(R) and (M)(R).</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="REGARDLESS"/>
    <xs:enumeration value="LEAST"/>
    <xs:enumeration value="MAXIMUM"/>
    <xs:enumeration value="LEAST_RPR"/>
    <xs:enumeration value="MAXIMUM_RPR"/>
    <xs:enumeration value="NONE"/>
  </xs:restriction>
</xs:simpleType>