NOTE The building element proxy should be used to exchange special types of building elements, for which the current IFC Release does not yet provide a semantic definition.

HISTORY: New entity in IFC Release 2.x.
ISSUE See issue and change logs for changes made in IFC Release 2.x.

Geometry Use Definitions

The geometric representation of any IfcBuildingElementProxy is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. The representation types defined at the supertype IfcBuildingElement also apply.

Local Placement

The local placement for any IfcBuildingElementProxy is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. The local placement can be given relativly.

Swept Solid Representation

Any building element proxy may be represented by a swept area solid (either by extrusion or by revolution). It is ensured by assigning the value 'SweptSolid' to the RepresentationType attribute of IfcShapeRepresentation. No further restrictions (e.g., for the profile or extrusion direction) are defined at this level.

CSG Representation

Any building element proxy may be represented by a CSG body. It has to include an IfcBooleanResult as the root expression of the CSG tree. It is ensured by assigning the value 'CSG' to the RepresentationType attribute of IfcShapeRepresentation. No further restrictions are defined at this level.