<simpleType name="investigationTargetEnumType">
  <annotation>
    <documentation>A controlled list that indicates the target being investigated by this feature: Deep Foundation - investigation of deep foundation elements. Earthworks - earth materials excavated and/or emplaced by engineering activity. Ground Improvement - activities designed to alter the characterstics of natural ground. Ground Water - hydrology and chemistry of ground water. Indoor Atmosphere - meteorology and chemistry of air in indoor spaces. Material Sample - a sample of material not derived from other enumerations in this list. Natural Ground - earth materials sampled in natural or undisturbed state. Outdoor Atmosphere - meteorology and chemistry of air in outdoor spaces. Surface Water - hydrology and chemistry of surface water.</documentation>
  </annotation>
  <restriction>
    <simpleType>
      <restriction base="string">
        <enumeration value="Deep Foundation"/>
        <enumeration value="Earthworks"/>
        <enumeration value="Ground Improvement"/>
        <enumeration value="Ground Water"/>
        <enumeration value="Indoor Atmosphere"/>
        <enumeration value="Material Sample"/>
        <enumeration value="Natural Ground"/>
        <enumeration value="Outdoor Atmosphere"/>
        <enumeration value="Pipeline"/>
        <enumeration value="Surface Water"/>
      </restriction>
    </simpleType>
    <whiteSpace value="preserve"/>
  </restriction>
</simpleType>