gml:Clothoid 

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 Information

Model

gml:refLocation , gml:scaleFactor , gml:startParameter , gml:endParameter
Children: gml:endParameter, gml:refLocation, gml:scaleFactor, gml:startParameter

Attributes

QName Type Fixed Default Use Inheritable Annotation
interpolation gml:CurveInterpolationType clothoid optional
numDerivativeInterior integer 0 optional
numDerivativesAtEnd integer 0 optional
numDerivativesAtStart integer 0 optional

Source 

<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>

Sample