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#CV-2x3-173

aggregates shall have more than one part
number
CV-2x3-173
based on
IFC2x3
effects
IFC2x3 coordination view 2.0
date
24. Oct 2011
initiator
ISG meeting in Budapest
summary aggregates shall have more than one part

 

Description

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