IFC 4.3.2.20251031 (IFC4X3_ADD2) under development

4.1.7.5 Product Topology Representation

产品的拓扑可以以多种方式表示，以满足不同的目的。每种表示都有一个众所周知的字符串标识符和一个特定的表示上下文。可能存在多个表示上下文来描述用于各种用途的拓扑。

下图展示了应用此概念时使用的通用类和关系。 此外，概念可能对常见或标准化的行业实践和场景具有特殊意义。对于这些特定的使用场景，下表展示了用户可采用的推荐通用使用模式列表。

G <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProduct.htm'>IfcProduct</a> IfcProduct 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1]      HasAssignments [0:?]      Nests [0:1]      IsNestedBy [0:?]      HasContext [0:1]      IsDecomposedBy [0:?]      Decomposes [0:1]      HasAssociations [0:?] 5. ObjectType [0:1]      IsDeclaredBy [0:1]      Declares [0:?]      IsTypedBy [0:1]      IsDefinedBy [0:?] 6. ObjectPlacement [0:1] 7. Representation [0:1]      ReferencedBy [0:?]      PositionedRelativeTo [0:?]      ReferencedInStructures [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a> IfcProductDefinitionShape 1. Name [0:1] 2. Description [0:1] 3. Representations [1:?]      ShapeOfProduct [1:?]      HasShapeAspects [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProduct.htm'>IfcProduct</a>:Representation1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a>:IfcProductDefinitionShape0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm'>IfcTopologyRepresentation</a> IfcTopologyRepresentation 1. ContextOfItems [1:1] 2. RepresentationIdentifier [0:1] 3. RepresentationType [0:1] 4. Items [1:?]      RepresentationMap [0:1]      LayerAssignments [0:?]      OfProductRepresentation [0:?]      OfShapeAspect [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a>:Representations1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm'>IfcTopologyRepresentation</a>:IfcTopologyRepresentation0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRepresentationContext.htm'>IfcRepresentationContext</a> IfcRepresentationContext 1. ContextIdentifier [0:1] 2. ContextType [0:1]      RepresentationsInContext [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm'>IfcTopologyRepresentation</a>:ContextOfItems1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRepresentationContext.htm'>IfcRepresentationContext</a>:IfcRepresentationContext0 IfcLabel_0 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm'>IfcTopologyRepresentation</a>:RepresentationIdentifier1->IfcLabel_0:IfcLabel0 IfcLabel_1 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm'>IfcTopologyRepresentation</a>:RepresentationType1->IfcLabel_1:IfcLabel0
Figure 4.1.7.5.A

General Usage

ApplicableEntity
IfcProduct
表 4.1.7.5.B

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