IFC 4.3.0.1 (IFC4X3_TC1)

4.8.5.2 Reference Topology

Structural activities may have a 'Reference' representation describing the distribution of a load.

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the tables below shows a recommended list of general usage patterns that users may adopt.

G IfcProduct 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:?] IfcProductDefinitionShape IfcProductDefinitionShape 1. Name [0:1] 2. Description [0:1] 3. Representations [1:?]      ShapeOfProduct [1:?]      HasShapeAspects [0:?] IfcProduct:Representation1->IfcProductDefinitionShape:IfcProductDefinitionShape0 IfcTopologyRepresentation IfcTopologyRepresentation 1. ContextOfItems [1:1] 2. RepresentationIdentifier [0:1] 3. RepresentationType [0:1] Topology 4. Items [1:?]      RepresentationMap [0:1]      LayerAssignments [0:?]      OfProductRepresentation [0:?]      OfShapeAspect [0:1] IfcProductDefinitionShape:Representations1->IfcTopologyRepresentation:IfcTopologyRepresentation0 IfcGeometricRepresentationContext IfcGeometricRepresentationContext 1. ContextIdentifier [0:1] 2. ContextType [0:1]      RepresentationsInContext [0:?] 3. CoordinateSpaceDimension [1:1] 4. Precision [0:1] 5. WorldCoordinateSystem [1:1] 6. TrueNorth [0:1]      HasSubContexts [0:?]      HasCoordinateOperation [0:1] IfcTopologyRepresentation:ContextOfItems1->IfcGeometricRepresentationContext:IfcGeometricRepresentationContext0 IfcRepresentationContext IfcRepresentationContext 1. ContextIdentifier [0:1] 2. ContextType [0:1]      RepresentationsInContext [0:?] IfcTopologyRepresentation:ContextOfItems1->IfcRepresentationContext:IfcRepresentationContext0 IfcLabel_0 IfcLabel IfcTopologyRepresentation:RepresentationIdentifier1->IfcLabel_0:IfcLabel0 IfcLabel_1 IfcLabel IfcTopologyRepresentation:RepresentationType1->IfcLabel_1:IfcLabel0 IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem      LayerAssignment [0:1]      StyledByItem [0:1] IfcTopologyRepresentation:Items1->IfcTopologicalRepresentationItem:IfcTopologicalRepresentationItem0
Figure 4.8.5.2.A

General Usage

ApplicableEntity
Topology
IfcTopologyRepresentation.Items
IfcStructuralCurveConnectionIfcEdge
IfcStructuralCurveMember IfcEdge
IfcStructuralPointConnectionIfcVertexPoint
IfcStructuralSurfaceMember IfcFaceSurface
Table 4.8.5.2.B