<simpleType name="LinearReferencingMethodNameEnum">
  <annotation>
    <documentation>An enumerated list of informative values of Linear Referencing Method names relevent to geotechnical and geoenvironmental engineering purposes. The terms are DIGGS-specific names, as extensions of the transportation-related names specified in ISO 19148:2021.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="trueFootage">
      <annotation>
        <documentation>Measurements are made in decimal feet along the linear element from its start, in the direction of the linear element</documentation>
      </annotation>
    </enumeration>
    <enumeration value="trueCentimeters">
      <annotation>
        <documentation>Measurements are made in decimal centimeters along the linear element from its start, in the direction of the linear element</documentation>
      </annotation>
    </enumeration>
    <enumeration value="trueInches">
      <annotation>
        <documentation>Measurements are made in decimal inches along the linear element from its start, in the direction of the linear element</documentation>
      </annotation>
    </enumeration>
    <enumeration value="trueMeters">
      <annotation>
        <documentation>Measurements are made in decimal meters along the linear element from its start, in the direction of the linear element</documentation>
      </annotation>
    </enumeration>
    <enumeration value="chainage">
      <annotation>
        <documentation>Measurements are made in decimal meters along the linear element from its start, in the direction of the linear element. Legacy term used in 2.6 incorrectly as an absolute measurement, as it could be used with units of "ft". Deprecated from Version 3.0. Use "trueMeters" instead</documentation>
      </annotation>
    </enumeration>
    <enumeration value="trueFootageWithOffset">
      <annotation>
        <documentation>Measurements are made in decimal feet along the linear element from its start, in the direction of the linear element. Then, if a diggs:offsetParameters is specified, this location is adjusted in accordance with the properties of the diggs:OffsetParameters object. Linearly referenced coordinates using this method are 2D coordinates representing the values of distance and offset in that order.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="trueMetersWithOffset">
      <annotation>
        <documentation>Measurements are made in decimal meters along the linear element from its start, in the direction of the linear element. Then, if a diggs:offsetParameters is specified, this location is adjusted in accordance with the properties of the diggs:OffsetParameters object. Linearly referenced coordinates using this method are 2D coordinates representing the values of distance and offset in that order.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="referenceFootage">
      <annotation>
        <documentation>Measurements are made in decimal feet along the linear element from a specified referent location, in the direction of the linear element.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="referenceMeters">
      <annotation>
        <documentation>Measurements are made in decimal meters along the linear element from a specified referent location, in the direction of the linear element.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="referenceFootageWithOffset">
      <annotation>
        <documentation>Measurements are made in decimal feet along the linear element from a specified referent location, in the direction of the linear element. Then, if a diggs:offsetParameters is specified, this location is adjusted in accordance with the properties of the diggs:OffsetParameters object. Linearly referenced coordinates using this method are 2D coordinates representing the values of distance and offset in that order.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="referenceMetersWithOffset">
      <annotation>
        <documentation>Measurements are made in decimal meters along the linear element from a specified referent location, in the direction of the linear element. Then, if diggs:offsetParameters is specified, this location is adjusted in accordance with the properties of the diggs:OffsetParameters object. Linearly referenced coordinates using this method are 2D coordinates representing the values of distance and offset in that order.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="inchMeasure">
      <annotation>
        <documentation>Measurement is expressed as decimal inches along the linear element, in the direction of the linear element. The exact location is determined from the two anchor points assigned along the linear element that bracket the neasurement location and then interpolating between these two points based on the length of the line segment between them. In DIGGS, used primarily for logging locations on a core sample.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="cmMeasure">
      <annotation>
        <documentation>Measurement is expressed as decimal centimeters along the linear element, in the direction of the linear element. The exact location is determined from the two anchor points assigned along the linear element that bracket the neasurement location and then interpolating between these two points based on the length of the line segment between them. In DIGGS, used primarily for logging locations on a core sample.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="footMeasure">
      <annotation>
        <documentation>Measurement is expressed as decimal feet along the linear element, in the direction of the linear element. The exact location is determined from the two anchor points assigned along the linear element that bracket the neasurement location and then interpolating between these two points based on the length of the line segment between them.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="meterMeasure">
      <annotation>
        <documentation>Measurement is expressed as decimal meters along the linear element, in the direction of the linear element. The exact location is determined from the two anchor points assigned along the linear element that bracket the neasurement location and then interpolating between these two points based on the length of the line segment between them.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>