注：定义根据ISO/CD 10303-42:1992
顶点是与点相对应的拓扑结构。它具有维数0和范围0。顶点的域，如果存在的话，就是m维实空间RM中的一个点；这由顶点点子类型表示。
注：实体改编自ISO 10303-42中定义的顶点。
IFC2.0中增加的新实体
非正式提议：
①顶点的维数为0。这是顶点的一个基本属性。
②顶点的范围被定义为零。
| # | 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 | |||||
EXPRESS Specification
ENTITY IfcVertex
SUPERTYPE OF(IfcVertexPoint)
SUBTYPE OF (IfcTopologicalRepresentationItem);
END_ENTITY;