#### IfcGeometricCurveSet

Natural language names

##### 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

`

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