Aggregates shall have more than one part 

Based on          IFC2x3

Initiator            ISG Meeting-Budapest

Effects              Coordination View 2.0

Date                    2011 10 24


All elements and element types that are exported as an aggregate*) shall have more than one component. The IfcRelAggregates relationship pointing to the subtype of IfcElement being the container element shall therefore have two or more RelatedObjects.

    NOTE In exceptional cases an aggregate may have only one component, therefore it is reported as a warning within the validation process. On import software applications shall accept aggregates with one or more components.

*) An aggregate is a subtype of IfcElement or IfcElementType having the (INV) relationship IsDecomposedBy established and pointing to an IfcRelAggregates relationship

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