IfcVertex

Semantic definitions at the entity

Entity definition

NOTE Definition according to ISO/CD 10303-42:1992
A vertex is the topological construct corresponding to a point. It has dimensionality 0 and extent 0. The domain of a vertex, if present, is a point in m dimensional real space R^M; this is represented by the vertex point subtype.

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

HISTORY New entity in IFC2.0

Informal Propositions:

The vertex has dimensionality 0. This is a fundamental property of the vertex.
The extent of a vertex is defined to be zero.

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
IfcTopologicalRepresentationItem
IfcVertex

Formal representations

XML Specification

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

 <xs:complexType name="IfcVertex">

  <xs:complexContent>

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

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcVertex

 SUPERTYPE OF(IfcVertexPoint)

 SUBTYPE OF (IfcTopologicalRepresentationItem);

END_ENTITY;

 EXPRESS-G diagram

	Vertex - Topologie
	Vertex
	Sommet