IfcRelReferencedInSpatialStructure

BACnet MVD

#### IfcRelReferencedInSpatialStructure

Natural language names

| Bezieht sich auf eine räumliche Struktur - Relation
| Rel Referenced In Spatial Structure

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRelReferencedInSpatialStructure |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.
RelatingStructure | X | X | MODIFIED | Type changed from IfcSpatialStructureElement to IfcSpatialElement.
IFC4 Addendum 2
IfcRelReferencedInSpatialStructure |  |  |  |
RelatingStructure |  | X | MODIFIED | Xsdformat 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

- site as IfcSite
- building as IfcBuilding
- storey as IfcBuildingStorey
- space as IfcSpace

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

Figure 173 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.

Figure 173 — Relationship for spatial structure referencing

> HISTORY New entity in IFC2x3.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

5

RelatedElements

IfcProduct

S[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

6

RelatingStructure

IfcSpatialElement

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

Rule | Description
--- | ---

AllowedRelatedElements

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.

> IFC4 CHANGE The relaxation to allow IfcSpace has been included.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

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,

> NOTE only the last modification in stored - either as addition, deletion or modification.

> IFC4 CHANGE The attribute has been changed to be OPTIONAL.

X

X

3 | Name | 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. | X | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcRelationship
IfcRelConnects
IfcRelReferencedInSpatialStructure

5

RelatedElements

IfcProduct

S[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

6

RelatingStructure

IfcSpatialElement

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 Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### 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;

EXPRESS-G diagram

`

References: IfcElement IfcSpatialElement

Link to this page