5.1.3.45 IfcRoot

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generelle Basisklasse

IfcRoot is the most abstract and root class for all IFC entity definitions that roots in the kernel or in subsequent layers of the IFC object model. 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.

NOTE  View definitions and implementation agreement may impose additional restrictions on the use of the OwnerHistory to handle object versioning.
HISTORY  New entity in IFC1.0
IFC4 CHANGE  The attribute OwnerHistory has been made OPTIONAL.

Common Use Definitions

 Instance diagram

Identity

The Identity concept applies to this entity.

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



Revision Control

The Revision Control concept applies to this entity.

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




XSD Specification:

 <xs:element name="IfcRoot" type="ifc:IfcRoot" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>
 <xs:complexType name="IfcRoot" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:Entity">
    <xs:sequence>
     <xs:element name="OwnerHistory" type="ifc:IfcOwnerHistory" nillable="true" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="GlobalId" type="ifc:IfcGloballyUniqueId" use="optional"/>
    <xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
    <xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

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;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

GlobalId : Assignment of a globally unique identifier within the entire software world.
OwnerHistory : 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.
Name : 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.
Description : Optional description, provided for exchanging informative comments.

Inheritance Graph:

ENTITY IfcRoot
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
END_ENTITY;

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