IfcRelReferencedInSpatialStructure
Definition from IAI: This 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.
NOTE The primary containment
relationship between an element and the spatial structure is handled
by IfcRelContainsInSpatialStructure.
Any element can be referenced to zero, one or several
levels of
the spatial structure.
EXAMPLE A wall might
be
normally contained within a storey, and since it does not span through
several stories, it is not referenced in any additional storey. However
a curtain wall might span through several stories, in this case it can
be contained within the ground floor, but it would be referenced by all
additional stories, it spans.
Predefined spatial structure elements to which elements can be
assigned are
- site as IfcSite
- building as IfcBuilding
- storey as IfcBuildingStorey
- space as IfcSpace
The same element class can be assigned to different
spatial
structure elements depending on the context.
HISTORY
New entity in Release IFC2x Edition 3.
Use case:
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The 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 floor. |
EXPRESS specification:
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ENTITY IfcRelReferencedInSpatialStructure
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WR31
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:
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SIZEOF(QUERY(temp <* RelatedElements | 'IFCPRODUCTEXTENSION.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF(temp))) = 0;
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Attribute definitions:
RelatedElements
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:
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Set of products, which are referenced within this level of the spatial structure hierarchy.
NOTE Referenced elements are contained elsewhere within the spatial structure, they are referenced additionally by this spatial structure element, e.g., because they span several stories.
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RelatingStructure
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:
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Spatial structure element, within which the element is referenced. Any element can be contained within zeor, one or many elements of the project spatial structure.
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Formal Propositions:
WR31
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:
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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.
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Inheritance graph
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ENTITY IfcRelReferencedInSpatialStructure;
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