IfcVertex

BACnet MVD

#### IfcVertex

Natural language names

| Vertex - Topologie
| Vertex
| Sommet

##### 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
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
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

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

`

References: IfcEdge IfcOrientedEdge IfcVertexLoop

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