IfcRelReferencedInSpatialStructure

Natural language names
Bezieht sich auf eine räumliche Struktur - Relation
Rel Referenced In Spatial Structure
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcRelReferencedInSpatialStructure
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      RelatingStructureXXMODIFIEDType changed from IfcSpatialStructureElement to IfcSpatialElement.
IFC4 Addendum 2
    IfcRelReferencedInSpatialStructure
      RelatingStructureXMODIFIEDXsdformat changed from Attribute to Hidden.
Semantic definitions at the entity
Entity 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. 

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. Whereas the IfcRelContainsInSpatialStructure 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.

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

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

Figure 170 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 170 — Relationship for spatial structure referencing

HISTORY  New entity in IFC2x3.
Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatedElementsIfcProductS[1:?] 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.
X
6RelatingStructureIfcSpatialElement Spatial structure element, within which the element is referenced. Any element can be contained within zero, one or many elements of the project spatial and zoning structure.
IFC4 CHANGE  The attribute RelatingStructure as been promoted to the new supertype IfcSpatialElement with upward compatibility for file based exchange.
X
Formal Propositions
RuleDescription
AllowedRelatedElementsThe 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.
IFC4 CHANGE  The relaxation to allow IfcSpace has been included.
Inherited definitions from supertypes
Entity inheritance IfcRelConnects IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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,
NOTE  only the last modification in stored - either as addition, deletion or modification.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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. X
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcRelationship
IfcRelConnects
IfcRelReferencedInSpatialStructure
5RelatedElementsIfcProductS[1:?] 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.
X
6RelatingStructureIfcSpatialElement Spatial structure element, within which the element is referenced. Any element can be contained within zero, one or many elements of the project spatial and zoning structure.
IFC4 CHANGE  The attribute RelatingStructure as been promoted to the new supertype IfcSpatialElement with upward compatibility for file based exchange.
X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelReferencedInSpatialStructure" type="ifc:IfcRelReferencedInSpatialStructure" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>
 <xs:complexType name="IfcRelReferencedInSpatialStructure">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelConnects">
    <xs:sequence>
     <xs:element name="RelatedElements">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcProduct" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcProduct"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelReferencedInSpatialStructure
 SUBTYPE OF (IfcRelConnects);
  RelatedElements : SET [1:?] OF IfcProduct;
  RelatingStructure : IfcSpatialElement;
 WHERE
  AllowedRelatedElements : SIZEOF(QUERY(temp <* RelatedElements | ('IFCPRODUCTEXTENSION.IfcSpatialStructureElement' IN TYPEOF(temp)) AND (NOT ('IFCPRODUCTEXTENSION.IfcSpace' IN TYPEOF(temp)))
)) = 0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElement IfcSpatialElement

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