<simpleType name="AnalysisApproachEnumType">
  <restriction base="string">
    <enumeration value="analytical method">
      <annotation>
        <documentation>The design was calculated using a published closed-form or semi-analytical method - for example the FHWA beam or strain-compatibility methods, BS 8006-1, EBGEO, CUR226 or the Nordic method - recorded in the design's designMethod.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="numerical analysis">
      <annotation>
        <documentation>The design was calculated using a numerical method, most commonly finite-element or finite-difference analysis, rather than a published closed-form analytical method.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="personal experience">
      <annotation>
        <documentation>The design was set by engineering judgment or precedent rather than an explicit analytical or numerical calculation.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="load testing">
      <annotation>
        <documentation>The design basis was established or verified by pre-production or proof load testing rather than by calculation alone.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>