注：定义根据ISO/CD 10303-42:1992
顶点是将其几何体定义为点的顶点。
注：实体改编自ISO 10303-42中定义的顶点。
IFC2x中的历史新实体。
非正式提议：
顶点的域被正式定义为其顶点的域。
| # | 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 | |||||
| IfcVertex | |||||
| IfcVertexPoint | |||||
| 1 | VertexGeometry | IfcPoint | [1:1] | The geometric point, which defines the position in geometric space of the vertex. | X |
EXPRESS Specification
ENTITY IfcVertexPoint
SUBTYPE OF (IfcVertex);
VertexGeometry : IfcPoint;
END_ENTITY;
原文：https://www.cnblogs.com/herd/p/14095465.html