<simpleType name="OffsetTypeEnumType">
  <restriction base="string">
    <enumeration value="perpendicular">
      <annotation>
        <documentation>Offset measured perpendicular to the tangent of the centerline at each point. The usual method for straight or gently curved features.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="constantBearing">
      <annotation>
        <documentation>Offset measured along a fixed compass bearing from each centerline point, rather than perpendicular to the local tangent. Used in marine surveys with sensor arrays that keep a constant orientation relative to north.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="radial">
      <annotation>
        <documentation>Offset measured radially outward from a defined center point, rather than perpendicular to the centerline. For circular or spiral survey patterns and radial sampling designs.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>