A clothoid, or Cornu's spiral, is plane curve whose curvature is a fixed function of its length.refLocation, startParameter, endParameter and scaleFactor have the same meaning as specified in ISO 19107:2003, 6.4.22.interpolation is fixed as "clothoid".The content model follows the general pattern for the encoding of curve segments.
<element name="Clothoid" type="gml:ClothoidType" substitutionGroup="gml:AbstractCurveSegment"><annotation><documentation>A clothoid, or Cornu's spiral, is plane curve whose curvature is a fixed function of its length. refLocation, startParameter, endParameter and scaleFactor have the same meaning as specified in ISO 19107:2003, 6.4.22. interpolation is fixed as "clothoid". The content model follows the general pattern for the encoding of curve segments.</documentation></annotation></element>