IfcGeometricCurveSet

Semantic definitions at the entity

Entity definition

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

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

NOTE: Corresponding STEP entity: geometric_set. Please refer to ISO/IS 10303-42:1994, p. 190 for the final definition of the formal standard.

HISTORY: New entity in IFC Release2x Edition 2.

Formal Propositions

Rule	Description
WR1	No surface shall be included in this geometric set.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	A
IfcRepresentationItem
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	[1:1]	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

XSD 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

  WR1 : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFCGEOMETRYRESOURCE.IFCSURFACE' IN TYPEOF(Temp))) = 0;
END_ENTITY;

 EXPRESS-G diagram