IFC (IFC4X3) development IfcGeometricCurveSet Semantic definition

The IfcGeometricCurveSet is used for the exchange of shape representation consisting of an collection of (2D or 3D) points and curves only. Entity inheritance Attributes

# Attribute Type Description
IfcRepresentationItem (2)
LayerAssignment SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems

Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

StyledByItem SET [0:1] OF IfcStyledItem FOR Item

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

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IfcGeometricSet (2)
1 Elements SET [1:?] OF IfcGeometricSetSelect

The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality.

* Dim IfcDimensionCount

This attribute is formally derived.


The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality.

Table Formal propositions

Name Description

No surface shall be included in this geometric set.

SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFC4X3_DEV_70ce626d.IFCSURFACE' IN TYPEOF(Temp))) = 0
Table Examples Formal representation

ENTITY IfcGeometricCurveSet
 SUBTYPE OF (IfcGeometricSet);
	NoSurfaces : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFC4X3_DEV_70ce626d.IFCSURFACE' IN TYPEOF(Temp))) = 0;
END_ENTITY; References

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  • where rule, NoSurfaces
  • where rule, WR1