The element provides a substitution group head for the surface patches based on parametric curves. All properties are specified in the derived subtypes. All derived subtypes shall conform to the constraints specified in ISO 19107:2003, 6.4.40.If provided, the aggregationType attribute shall have the value "set".
<element name="AbstractParametricCurveSurface" type="gml:AbstractParametricCurveSurfaceType" abstract="true" substitutionGroup="gml:AbstractSurfacePatch"><annotation><documentation>The element provides a substitution group head for the surface patches based on parametric curves. All properties are specified in the derived subtypes. All derived subtypes shall conform to the constraints specified in ISO 19107:2003, 6.4.40. If provided, the aggregationType attribute shall have the value "set".</documentation></annotation></element>