IFC 4.3.2.20260714 (IFC4X3_ADD2) under development

4.1.7.5 Product Topology Representation（产品拓扑表示）

产品的拓扑可以多种方式进行表示，以用于不同目的。每种表示都有一个公认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，用于描述不同用途的拓扑。

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。

<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
图 4.1.7.5.A

通用用法

ApplicableEntity
IfcProduct
表 4.1.7.5.B

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