4.6.1 Aggregation

Aggregation indicates an unordered part composition relationship.

Aggregation is used on building elements to indicate parts such as studs within a wall.

Aggregation is used on systems to indicate subsystems such as branch circuits.

Figure 16 illustrates an instance diagram.

AggregationIfcObjectDefinitionIfcRelAggregatesIfcObject

Figure 16 — Aggregation

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