<simpleType name="DiggsDensityUomEnumType">
  <annotation>
    <documentation>This enumerated list extends eml:MassPerVolumeUom</documentation>
  </annotation>
  <restriction base="eml:UomEnum">
    <enumeration value="kN/m3">
      <annotation>
        <documentation>kilonewton per cubic metre</documentation>
      </annotation>
    </enumeration>
    <enumeration value="klbf/ft3">
      <annotation>
        <documentation>thousand pound-force (kips) per cubic foot</documentation>
      </annotation>
    </enumeration>
    <enumeration value="slug/ft3">
      <annotation>
        <documentation>slug (mass) per cubic foot</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>