IfcSystem

IfcSystem

Definition from IAI: Organized combination of related parts within an AEC product, composed for a common purpose or function or to provide a service. System is essentially a functional related aggregation of products. The grouping relationship to IfcProduct is handled by IfcRelGroups.

NOTE: The use of IfcSystem often applies to the representation of building services related systems, such as the piping system, cold water system, etc. Members within such a system may or may not be connected using the connectivity related entities (e.g. through IfcPort).

HISTORY: New entity in IFC Release 1.0

EXPRESS specification:

ENTITY IfcSystem

SUBTYPE OF (

IfcGroup);

INVERSE

ServicesBuildings

SET [0:1] OF IfcRelServicesBuildings FOR RelatingSystem;

WHERE

WR1

SIZEOF (QUERY (temp <* SELF\IfcGroup.IsGroupedBy.RelatedObjects | NOT('IFCPRODUCTEXTENSION.IFCELEMENT' IN TYPEOF(temp)))) = 0;

END_ENTITY;

Attribute definitions:

ServicesBuildings

Reference to the building via the objectified relationship IfcRelServicesBuildings, which is serviced by the system.

Formal Propositions:

WR1

A system is grouped by the objectified relationship IfcRelAssignsToGroup. Only objects of type IfcElement should be grouped into a system group.

Inheritance graph

ENTITY IfcSystem;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObject;

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDefinedBy

SET OF IfcRelDefines FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

Decomposes

SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;

IsDecomposedBy

SET OF IfcRelDecomposes FOR RelatingObject;

ENTITY IfcGroup;

INVERSE

IsGroupedBy

IfcRelAssignsToGroup FOR RelatingGroup;

ENTITY IfcSystem;

INVERSE

ServicesBuildings

SET [0:1] OF IfcRelServicesBuildings FOR RelatingSystem;

END_ENTITY;