IfcVertexLoop

Semantic definitions at the entity

Entity definition

NOTE Definition according to ISO/CD 10303-42:1992
A vertex_loop is a loop of zero genus consisting of a single vertex. A vertex can exist independently of a vertex loop. The topological data shall satisfy the following constraint:

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

HISTORY New entity in IFC2x2.

Informal Propositions:

A vertex loop has zero extent and dimensionality.
The vertex loop has genus 0.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	LoopVertex	IfcVertex	[1:1]	The vertex which defines the entire loop.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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.	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.	X
IfcTopologicalRepresentationItem
IfcLoop
IfcVertexLoop
1	LoopVertex	IfcVertex	[1:1]	The vertex which defines the entire loop.	X

Formal representations

XSD Specification

 <xs:element name="IfcVertexLoop" type="ifc:IfcVertexLoop" substitutionGroup="ifc:IfcLoop" nillable="true"/>

 <xs:complexType name="IfcVertexLoop">

  <xs:complexContent>

   <xs:extension base="ifc:IfcLoop">

    <xs:sequence>

     <xs:element name="LoopVertex" type="ifc:IfcVertex" nillable="true"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcVertexLoop

 SUBTYPE OF (IfcLoop);

  LoopVertex : IfcVertex;

END_ENTITY;

 EXPRESS-G diagram

	Vertexschleife - Topologie
	Vertex Loop
	Boucle de points