<xs:simpleType name="ReciprocalAreaUom">
  <xs:restriction base="eml:UomEnum">
    <xs:enumeration value="1/ft2">
      <xs:annotation>
        <xs:documentation>per square foot</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="1/km2">
      <xs:annotation>
        <xs:documentation>per square kilometre</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="1/m2">
      <xs:annotation>
        <xs:documentation>per square metre</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="1/mi2">
      <xs:annotation>
        <xs:documentation>per square mile</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>