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IfcRelContainedInSpatialStructure

Definition from IAI: This objectified relationship, IfcRelContainedInSpatialStructure, is used to assign elements to a certain level of the spatial project structure. Any element can only be assigned once to a certain level of the spatial structure. The question, which level is relevant for which type of element, can only be answered within the context of a particular project and might vary within the various regions.

EXAMPLE A multi-storey space is contained (or belongs to) the building storey at which its ground level is, but it is referenced by all the other building storeys, in which it spans. A lift shaft might be contained by the basement, but referenced by all storeys, through which it spans. The reference relationship can be expressed by the general grouping mechanism estabished in IFC.

Predefined spatial structure elements to which elements can be assigned are

The same element can be assigned to different spatial structure elements depending on the context.

EXAMPLE A wall might be normally assigned to a storey, however the curtain wall might be assigned to the building and the retaining wall in the terrain might be assigned to the site.

HISTORY New entity in IFC Release 2x.

IFC2x PLATFORM CHANGE: The data type of the attribute RelatedElements has been changed from IfcElement to its supertype IfcProduct with upward compatibility for file based exchange.

Use case:

fig1 
 The figure shows the use of IfcRelContainedInSpatialStructure to assign a stair and two walls to two different levels within the spatial structure. 

EXPRESS specification:

ENTITY IfcRelContainedInSpatialStructure
SUBTYPE OF ( IfcRelConnects);
RelatedElements  :  SET [1:?] OF IfcProduct;
RelatingStructure  :  IfcSpatialStructureElement;
WHERE
WR31  :  SIZEOF(QUERY(temp <* RelatedElements | 'IFCPRODUCTEXTENSION.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF(temp))) = 0;
END_ENTITY;

Attribute definitions:

RelatedElements  :  Set of elements products, which are contained within this level of the spatial structure hierarchy.
IFC2x PLATFORM CHANGE  The data type has been changed from IfcElement to IfcProduct with upward compatibility

RelatingStructure  :  Spatial structure element, within which the element is contained. Any element can only be contained within one element of the project spatial structure.

Formal Propositions:

WR31  :  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.

Inheritance graph

ENTITY IfcRelContainedInSpatialStructure;
ENTITY IfcRoot;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcRelationship;
ENTITY IfcRelConnects;
ENTITY IfcRelContainedInSpatialStructure;
RelatedElements  :  SET [1:?] OF IfcProduct;
RelatingStructure  :  IfcSpatialStructureElement;
END_ENTITY;