5.1.3.44 IfcRoot

ABSTRACT This definition may not be instantiated

5.1.3.44.1 Semantic definition

IfcRoot is the most abstract and root class for all entity definitions that roots in the kernel or in subsequent layers of the IFC specification. It is therefore the common supertype of all IFC entities, beside those defined in an IFC resource schema. All entities that are subtypes of IfcRoot can be used independently, whereas resource schema entities, that are not subtypes of IfcRoot, are not supposed to be independent entities.

5.1.3.44.6 Formal representation

ENTITY IfcRoot
ABSTRACT SUPERTYPE OF (ONEOF
(IfcObjectDefinition
,IfcPropertyDefinition
,IfcRelationship));
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
UNIQUE
UR1 : GlobalId;
END_ENTITY;

5.1.3.44.7 References

5.1.3.44.8 Changelog

5.1.3.44.8.1 IFC4

• attribute OwnerHistory optional, Is now optional