<simpleType name="geotechnicalDensityUom">
  <restriction base="eml:UomEnum">
    <enumeration value="kN/m3">
      <annotation>
        <documentation>kilo-Newton per cubic meter</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>Slugs (mass) per cubic foot</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>