<simpleType name="TensionSourceEnumType">
  <restriction base="string">
    <enumeration value="arching">
      <annotation>
        <documentation>Tension mobilized in the geosynthetic by the membrane effect between column heads within the load transfer platform.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="lateral spreading">
      <annotation>
        <documentation>Tension mobilized to resist lateral spreading of the treated ground, typically near a slope or free face.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="differential settlement">
      <annotation>
        <documentation>Tension mobilized by differential settlement across the reinforced zone.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="sum">
      <annotation>
        <documentation>The combined design tension summing the individual load-path components for this layer.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>