IFC (IFC4X3_ADD2) under development IfcRelReferencedInSpatialStructure

RV ⓘ
AbV ⓘ Semantic definition

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

Elements can also be referenced in a spatial zone that is provided as IfcSpatialZone.

Figure 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.

reference and containment
Figure — Relationship for spatial structure referencing Entity inheritance Attributes

# Attribute Type Description
IfcRoot (4)
1 GlobalId IfcGloballyUniqueId

Assignment of a globally unique identifier within the entire software world.

2 OwnerHistory OPTIONAL IfcOwnerHistory

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,

3 Name OPTIONAL IfcLabel

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.

4 Description OPTIONAL IfcText

Optional description, provided for exchanging informative comments.

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IfcRelReferencedInSpatialStructure (2)
5 RelatedElements SET [1:?] OF IfcSpatialReferenceSelect

Set of objects, which are referenced within this level of the spatial structure hierarchy.

6 RelatingStructure IfcSpatialElement

Spatial structure element, within which the objects are referenced. An object can be referenced within multiple elements of the project spatial structure.

Table Formal propositions

Name Description

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.

)) = 0
Table Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

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Table Formal representation

ENTITY IfcRelReferencedInSpatialStructure
 SUBTYPE OF (IfcRelConnects);
	RelatedElements : SET [1:?] OF IfcSpatialReferenceSelect;
	RelatingStructure : IfcSpatialElement;
	AllowedRelatedElements : SIZEOF(QUERY(temp <* RelatedElements | ('IFC4X3_DEV_5d53fb2.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF(temp)) AND (NOT ('IFC4X3_DEV_5d53fb2.IFCSPACE' IN TYPEOF(temp)))
)) = 0;
END_ENTITY; References

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