The objectified relationship, IfcRelReferencedInSpatialStructure is used to assign elements in addition to those levels of the project spatial structure, in which they are referenced, but not primarily contained. It is also used to connect a system to the relevant spatial element that it serves.
Any element can be referenced to zero, one or several levels of the spatial structure. Whereas the IfcRelContainedInSpatialStructure relationship is required to be hierarchical (an element can only be contained in exactly one spatial structure element), the IfcRelReferencedInSpatialStructure is not restricted to be hierarchical.
Predefined spatial structure elements to which elements can be assigned are
- site as IfcSite
- facility as IfcFacility or its subtypes IfcBridge, IfcBuilding, IfcMarineFacility, IfcRailway or IfcRoad
- part of facility as IfcFacilityPart, or more specifically as IfcBuildingStorey or IfcSpace
Elements can also be referenced in a spatial zone that is provided as IfcSpatialZone.
Figure 184.108.40.206.A shows the use of IfcRelContainedInSpatialStructure and IfcRelReferencedInSpatialStructure to assign an IfcCurtainWall to two different levels within the spatial structure. It is primarily contained within the ground floor, and additionally referenced within the first and second floor.
Assignment of a globally unique identifier within the entire software world.
Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.
Optional description, provided for exchanging informative comments.
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|5||RelatedElements||SET [1:?] OF IfcSpatialReferenceSelect||
Set of objects, which are referenced within this level of the spatial structure hierarchy.
Spatial structure element, within which the objects are referenced. An object can be referenced within multiple elements of the project spatial structure.
The relationship object shall not be used to include other spatial structure elements into a spatial structure element. The hierarchy of the spatial structure is defined using IfcRelAggregates. Exception: an IfcSpace can be referenced by another spatial structure element, in particular by an IfcSpatialZone.
Ownership, history, and merge state is captured using IfcOwnerHistory.
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
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ENTITY IfcRelReferencedInSpatialStructure SUBTYPE OF (IfcRelConnects); RelatedElements : SET [1:?] OF IfcSpatialReferenceSelect; RelatingStructure : IfcSpatialElement; WHERE AllowedRelatedElements : SIZEOF(QUERY(temp <* RelatedElements | ('IFC4X3_DEV_6fc976c.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF(temp)) AND (NOT ('IFC4X3_DEV_6fc976c.IFCSPACE' IN TYPEOF(temp))) )) = 0; END_ENTITY;