IfcCurveOnSurface

Item	SPF	XML	Change	Description
IFC2x3 to IFC4 4.0.0.0
IfcCurveOnSurface			ADDED

Semantic definitions at the type

Type definition

The IfcCurveOnSurface enables the choice of curve types on parameteric surface.

NOTE Definition according to ISO/CD 10303-42:1992
A curve_on_surface is a curve on a parametric surface. It may be any of the following: > * a pcurve or

a surface curve, including the specialised subtypes of intersection curve and seam curve, or

a composite curve on surface.

The curve on surface select type collects these curves together for reference purposes.

NOTE Type adapted from curve_on_surface defined in ISO 10303-42.

HISTORY New type in IFC4.

Select definition

Type	Description
IfcCompositeCurveOnSurface
IfcPcurve
IfcSurfaceCurve

Formal representations

XML Specification

 <xs:group name="IfcCurveOnSurface">

  <xs:choice>

   <xs:element ref="ifc:IfcCompositeCurveOnSurface"/>

   <xs:element ref="ifc:IfcPcurve"/>

   <xs:element ref="ifc:IfcSurfaceCurve"/>

  </xs:choice>

 </xs:group>

EXPRESS Specification


TYPE IfcCurveOnSurface = SELECT (

 IfcCompositeCurveOnSurface, 
 IfcPcurve, 
 IfcSurfaceCurve);
END_TYPE;


 EXPRESS-G diagram

	Kurve auf einer Fläche
	Curve On Surface