Natural language names
Vertex - Topologie
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 RM; 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:

  1. The vertex has dimensionality 0. This is a fundamental property of the vertex.
  2. The extent of a vertex is defined to be zero.
Inherited definitions from supertypes
Entity inheritance IfcVertexPoint IfcTopologicalRepresentationItem IfcRepresentationItem
Attribute inheritance
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.
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.
Formal representations
XML Specification
 <xs:element name="IfcVertex" type="ifc:IfcVertex" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcVertex">
   <xs:extension base="ifc:IfcTopologicalRepresentationItem"/>
EXPRESS Specification
ENTITY IfcVertex
 SUPERTYPE OF(IfcVertexPoint)
 SUBTYPE OF (IfcTopologicalRepresentationItem);

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcEdge IfcOrientedEdge IfcVertexLoop

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