IfcGeometricCurveSet

Semantic definitions at the entity

Entity definition

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

NOTE Definition according to ISO/CD 10303-42:1992
A geometric curve set is a collection of two or three dimensional points and curves.

NOTE Entity adapted from geometric_curve_set defined in ISO 10303-42.

HISTORY New entity in IFC2x2.

Formal Propositions

Rule	Description
NoSurfaces	No surface shall be included in this geometric set.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	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.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	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.	X
IfcGeometricRepresentationItem
IfcGeometricSet
1	Elements	IfcGeometricSetSelect	S[1:?]	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.	X
	Dim :=Elements[1].Dim	IfcDimensionCount		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.	X
IfcGeometricCurveSet

Formal representations

XML Specification

 <xs:element name="IfcGeometricCurveSet" type="ifc:IfcGeometricCurveSet" substitutionGroup="ifc:IfcGeometricSet" nillable="true"/>

 <xs:complexType name="IfcGeometricCurveSet">

  <xs:complexContent>

   <xs:extension base="ifc:IfcGeometricSet"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcGeometricCurveSet

 SUBTYPE OF (IfcGeometricSet);

 WHERE

  NoSurfaces : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |

'IFCGEOMETRYRESOURCE.IfcSurface' IN TYPEOF(Temp))) = 0;
END_ENTITY;

 EXPRESS-G diagram

	Geometrische Gruppe - Punkte und Kurven
	Geometric Curve Set