8.9.3.44 IfcPcurve

8.9.3.44.1 Semantic definition

The IfcPcurve is a curve defined within the parameter space of its reference surface.

8.9.3.44.2 Entity inheritance

8.9.3.44.3 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. IFC2x3-CHANGE The inverse attribute LayerAssignments has been added. IFC4-CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
	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. IFC2x3-CHANGE The inverse attribute StyledByItem has been added.
IfcCurve (1)
*	Dim	IfcDimensionCount	This attribute is formally derived. `IfcCurveDim(SELF)` The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.
Click to show 3 hidden inherited attributes
IfcPcurve (2)
1	BasisSurface	IfcSurface	No description available.
2	ReferenceCurve	IfcCurve	No description available.

Table 8.9.3.44.A

8.9.3.44.4 Formal propositions

Name	Description
DimIs2D	The dimensionality of the parameter space curve shall be 2.
`ReferenceCurve.Dim = 2`

Table 8.9.3.44.B

8.9.3.44.5 Formal representation

 ENTITY IfcPcurve
 SUBTYPE OF (IfcCurve);
	BasisSurface : IfcSurface;
	ReferenceCurve : IfcCurve;
 WHERE
	DimIs2D : ReferenceCurve.Dim = 2;
END_ENTITY;

8.9.3.44 IfcPcurve

8.9.3.44.1 Semantic definition

8.9.3.44.2 Entity inheritance

8.9.3.44.3 Attributes

8.9.3.44.4 Formal propositions

8.9.3.44.5 Formal representation

8.9.3.44.6 References

8.9.3.44.7 Changelog

8.9.3.44.7.1 IFC4

	ENTITY IfcPcurve
	SUBTYPE OF (IfcCurve);
	BasisSurface : IfcSurface;
	ReferenceCurve : IfcCurve;
	WHERE
	DimIs2D : ReferenceCurve.Dim = 2;
	END_ENTITY;