<xs:simpleType name="SecondMomentOfAreaUom">
  <xs:restriction base="eml:UomEnum">
    <xs:enumeration value="cm4">
      <xs:annotation>
        <xs:documentation>centimetre to the fourth power</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="in4">
      <xs:annotation>
        <xs:documentation>inch to the fourth power</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="m4">
      <xs:annotation>
        <xs:documentation>metre to the fourth power</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>