IFC 4.3.x development

5.4.3.48 IfcRelServicesBuildings

Change log

IFC4

modificationsattributes RelatedBuildings definitionChanged from set[1:?] of IfcSpatialStructureElement to set[1:?] of IfcSpatialElement

5.4.3.48.1 Semantic definitions at the entity

The IfcRelServicesBuildings is an objectified relationship that defines the relationship between a system and the sites, buildings, storeys, spaces, or spatial zones, it serves. Examples of systems are:

  • building service systems (heating, cooling, waste water system) represented by instances of IfcDistributionSystem;
  • building systems (fenestration, shading) represented by instances of IfcBuildingSystem;
  • zones as collection of logically grouped spaces represented by instances of IfcZone
  • idealized structural analysis systems represented by instances of IfcStructuralAnalysisModel.

NOTE  The name IfcRelServicesBuildings is a known anomaly, as the relationship is not restricted to buildings anymore.

HISTORY  New entity in IFC1.0.

IFC2x CHANGE  The data type of the attribute RelatedBuildings has been changed from IfcBuilding to its supertype IfcSpatialStructureElement with upward compatibility for file based exchange.

5.4.3.48.1 Attributes

#Attribute Type Description
IfcRoot
1GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2OwnerHistory 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,

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

> IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
3Name 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.
4Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcRelationship
IfcRelConnects
IfcRelServicesBuildings
5RelatingSystem IfcSystem System that services the Buildings.
6RelatedBuildingsSET [1:?] OF IfcSpatialElementSpatial structure elements (including site, building, storeys) that are serviced by the system.

> IFC2x CHANGE  The data type has been changed from IfcBuilding to IfcSpatialStructureElement with upward compatibility for file based exchange.

> IFC4 CHANGE  The data type has been changed from IfcSpatialStructureElement to IfcSpatialElement with upward compatibility for file based exchange.

5.4.3.48.2 Entity inheritance

dot_inheritance IfcRelServicesBuildings IfcRelServicesBuildings IfcRelConnects IfcRelConnects IfcRelServicesBuildings->IfcRelConnects IfcRelConnects_children 15 more... IfcRelConnects_children->IfcRelConnects IfcRelationship IfcRelationship IfcRelConnects->IfcRelationship IfcRelationship_children 5 more... IfcRelationship_children->IfcRelationship IfcRoot IfcRoot IfcRelationship->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot

5.4.3.48.3 Definitions applying to General Usage

5.4.3.48.3.1 Identity

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

5.4.3.48.3.2 Revision Control

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

5.4.3.48.4 Formal representations

ENTITY IfcRelServicesBuildings
 SUBTYPE OF (IfcRelConnects);
	RelatingSystem : IfcSystem;
	RelatedBuildings : SET [1:?] OF IfcSpatialElement;
END_ENTITY;