<simpleType name="investigationTargetEnumExtType">
  <annotation>
    <documentation>A controlled list that indicates the target being investigated by this feature (feature of interest): Deep Foundation - investigation of deep foundation elements. Earthworks - earth materials excavated and/or emplaced by engineering activity. Ground Improvement - observations of and 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. 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. Other terms can be used by prefacing the term with "Other:"</documentation>
  </annotation>
  <union memberTypes="diggs:investigationTargetEnumType diggs:OtherNameType"/>
</simpleType>