IfcBuildingSystem

6.1.3.6 IfcBuildingSystem

	Système
	Bauliches System

A building system is a group by which building elements are grouped according to a common function within the building.

HISTORY New entity in IFC4.

The group IfcBuildingSystem defines the occurrence of a specialized system for use within the context of a building and finishing fabric. Important functionalities for the description of a building system are derived from supertypes:

From IfcSystem it inherits the ability to couple the building system via IfcRelServicesBuildings to one or more IfcSpatialElement subtypes as necessary.

From IfcGroup it inherits the inverse attribute IsGroupedBy, pointing to the relationship class IfcRelAssignsToGroup. This allows to group building elements (instances of IfcBuildingElement subtypes, IfcFurnishingElement subtype, IfcElementAssembly and IfcTransportElement).

From IfcObjectDefinition it inherits the inverse attribute IsDecomposedBy pointing to the relationship class IfcRelAggregates. It provides the hierarchy between the separate (partial) building systems.

Common Use Definitions

The following concepts are inherited at supertypes:

IfcRoot: Identity, Revision Control

Instance diagram

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 93.

PredefinedType Name

Pset_BuildingSystemCommon

Pset_ServiceLifeFactors

Table 93 — IfcBuildingSystem Property Sets for Objects

Object Aggregation

The Object Aggregation concept applies to this entity as shown in Table 94.

PredefinedType RelatedObjects Description

IfcBuildingSystem Building systems may be aggregated into subsystems.

Table 94 — IfcBuildingSystem Object Aggregation

Group Assignment

The Group Assignment concept applies to this entity as shown in Table 95.

Type Description

IfcBuildingElement Building elements participating in the building system.

Table 95 — IfcBuildingSystem Group Assignment

XSD Specification:

<xs:element name="IfcBuildingSystem" type="ifc:IfcBuildingSystem" substitutionGroup="ifc:IfcSystem" nillable="true"/>
<xs:complexType name="IfcBuildingSystem">
  <xs:complexContent>
   <xs:extension base="ifc:IfcSystem">
    <xs:attribute name="PredefinedType" type="ifc:IfcBuildingSystemTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcBuildingSystem

SUBTYPE OF IfcSystem;

PredefinedType

OPTIONAL IfcBuildingSystemTypeEnum;

END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType

Predefined types of distribution systems.

Inheritance Graph:

ENTITY IfcBuildingSystem

ENTITY IfcRoot

GlobalId	:	IfcGloballyUniqueId;
OwnerHistory	:	OPTIONAL IfcOwnerHistory;
Name	:	OPTIONAL IfcLabel;
Description	:	OPTIONAL IfcText;

ENTITY IfcObjectDefinition

INVERSE

HasAssignments	:	SET OF IfcRelAssigns FOR RelatedObjects;
Nests	:	SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy	:	SET OF IfcRelNests FOR RelatingObject;
HasContext	:	SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy	:	SET OF IfcRelAggregates FOR RelatingObject;
Decomposes	:	SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations	:	SET OF IfcRelAssociates FOR RelatedObjects;

ENTITY IfcObject

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDeclaredBy	:	SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares	:	SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy	:	SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy	:	SET OF IfcRelDefinesByProperties FOR RelatedObjects;

ENTITY IfcGroup

INVERSE

IsGroupedBy

SET OF IfcRelAssignsToGroup FOR RelatingGroup;

ENTITY IfcSystem

INVERSE

ServicesBuildings

SET [0:1] OF IfcRelServicesBuildings FOR RelatingSystem;

ENTITY IfcBuildingSystem

PredefinedType

OPTIONAL IfcBuildingSystemTypeEnum;

END_ENTITY;

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