Vertex - Topologie | |

Vertex | |

Sommet |

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 spaceR; this is represented by the vertex point subtype.^{M}

NOTE Entity adapted fromvertexdefined 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.

# | 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 IFC4 CHANGE The inverse attribute | 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 | X | |

IfcTopologicalRepresentationItem | |||||

IfcVertex |

` <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>

```
ENTITY IfcVertex
```

SUPERTYPE OF(IfcVertexPoint)

SUBTYPE OF (IfcTopologicalRepresentationItem)**;**

END_ENTITY;

References: IfcEdge IfcOrientedEdge IfcVertexLoop