IFC 4.3.0.1 (IFC4X3) development

4.4.1.1 Element Composition

Provision of an aggregation structure where the element is part of another element representing the composite. The part then provides, if such concepts are in scope of the Model View Definition, exclusively the following:

  • Body Geometry — The partial body shape representation and its placement;
  • Material — The material information for the part.

The part may also provide, in addition to the aggregate, more specifically the following:

  • Property Sets — The parts may have individual property sets assigned, solely or in addition to the composite;
  • Quantity Sets — The parts may have individual quantity sets assigned, solely or in addition to the composite.

The part should not be contained in the spatial hierarchy, i.e. the concept Spatial Containment shall not be used at the level of parts. The part is contained in the spatial structure by the spatial containment of its composite.

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 IfcElement_0 IfcElement 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      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:?] 8. Tag [0:1]      FillsVoids [0:1]      ConnectedTo [0:?]      IsInterferedByElements [0:?]      InterferesElements [0:?]      HasProjections [0:?]      HasOpenings [0:?]      IsConnectionRealization [0:?]      ProvidesBoundaries [0:?]      ConnectedFrom [0:?]      ContainedInStructure [0:1]      HasCoverings [0:?]      HasSurfaceFeatures [0:?] IfcRelAggregates IfcRelAggregates 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1] RelatingObject 5. RelatingObject [1:1] 6. RelatedObjects [1:?] IfcElement_0:Decomposes1->IfcRelAggregates:RelatedObjects0 IfcElement_1 IfcElement 1. GlobalId [1:1] 2. OwnerHistory [0:1] ElementName 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:?] 8. Tag [0:1]      FillsVoids [0:1]      ConnectedTo [0:?]      IsInterferedByElements [0:?]      InterferesElements [0:?]      HasProjections [0:?]      HasOpenings [0:?]      IsConnectionRealization [0:?]      ProvidesBoundaries [0:?]      ConnectedFrom [0:?]      ContainedInStructure [0:1]      HasCoverings [0:?]      HasSurfaceFeatures [0:?] IfcRelAggregates:RelatingObject1->IfcElement_1:IfcElement0 IfcLabel IfcLabel IfcElement_1:Name1->IfcLabel:IfcLabel0
Figure 4.4.1.1.A

General Usage

ApplicableEntity
IfcBeam
Table 4.4.1.1.B

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