<simpleType name="LithologyCharacterEnumType">
  <union>
    <simpleType>
      <restriction base="string">
        <enumeration value="uniformly distributed as a component of the primary lithology"/>
        <enumeration value="interbedded with the primary lithology"/>
        <enumeration value="incorporated as inclusions within the primary lithology"/>
      </restriction>
    </simpleType>
    <simpleType>
      <restriction base="string">
        <pattern value="Other: .{2,}"/>
      </restriction>
    </simpleType>
  </union>
</simpleType>