Open evandroAlfieri opened 3 days ago
We (Trimble Solutions Sandvika) also need to know what type of association can be used between the ifcSpatialZones that build up a parallel "non-hierarchical graph structure". Parallel to the spatial breakdown structure. By using ifcRelAggregates (as for the Spatial Breakdown Structure) it implies that the ifcSpatialZone structure is hierarchical, which is not always the case.
And we need to know how to associate/connect the ifcSpatialZone "non-hierarchical graph structure" to the Spatial Breakdown Structure:
Several issue regarding the documentation of IfcSpatialZone, raised by implementers trying to support it.
Issue 1
IfcSpatialZone documentation says:
However, IfcSpatialZone inherits from IfcSpatialElement the ability to contain physical elements (i.e., using IfcRelContainedInSpatialStructure
These two scenarios are in contrast. Shall the quoted constrain be enforced?
Issue 2
IfcSpatialZone documentation says:
However, IfcSpatialZone inherits from IfcObjectDefinition the ability to aggregates/be aggregated other (Spatial) Elements (i.e., using IfcRelAggregates)
These two scenarios are in contrast. Shall the quoted constrain be enforced?
Note that the same issue applies to IfcSpaces, as IfcSpatialZone documentations says:
Issue 3
Spatial Composition (and Decomposition) concept templates say:
A few uncertainties in the above statement:
open questions
The above inconstancies are preventing implementers to have clear, unambiguous answers to the following questions: