<simpleType name="SeismicSiteClassEnumType">
  <annotation>
    <documentation>Seismic site classification (IBC/ASCE 7 Site Class A to F, based on the average properties of the upper profile at the site). It states the interpreted classification only; the composite shear-wave velocity a determination is based on is a separate measurement (diggs:LabVelocityTest, diggs:GeophysicalFieldSurvey). The class descriptions are stated from the general definition in the standard, not from the table of a specific edition.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="class a">
      <annotation>
        <documentation>Hard rock with high shear-wave velocity, at the stiff end of the site class range.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="class b">
      <annotation>
        <documentation>Rock of moderate to high shear-wave velocity, softer than Site Class A.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="class c">
      <annotation>
        <documentation>Very dense soil or soft rock, typically high blow count or high undrained shear strength.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="class d">
      <annotation>
        <documentation>Stiff soil, the default classification where site-specific data is insufficient to assign another class.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="class e">
      <annotation>
        <documentation>Soft clay soil, or any profile with a sufficient thickness of soft clay meeting the standard's plasticity, moisture and strength thresholds.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="class f">
      <annotation>
        <documentation>Soils requiring a site-specific geotechnical investigation and dynamic site response analysis - liquefaction-vulnerable soils, peats, highly organic clays, very high plasticity clays, or very thick soft-to-medium-stiff clays.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>