<xs:simpleType name="VolumePerAreaUom">
  <xs:restriction base="eml:UomEnum">
    <xs:enumeration value="1E6 bbl/acre">
      <xs:annotation>
        <xs:documentation>million barrel per acre</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="bbl/acre">
      <xs:annotation>
        <xs:documentation>barrel per acre</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="ft3/ft2">
      <xs:annotation>
        <xs:documentation>cubic foot per square foot</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="m3/m2">
      <xs:annotation>
        <xs:documentation>cubic metre per square metre</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>