Natural language names
 | generelle Basisklasse |
 | Root |
 | Racine |
| generelle Basisklasse |
| Root |
| Racine |
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.
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.
| # | Attribute | Type | Cardinality | Description | B |
|---|---|---|---|---|---|
| 1 | GlobalId | IfcGloballyUniqueId | [1:1] | Assignment of a globally unique identifier within the entire software world. | X |
| 2 | OwnerHistory | IfcOwnerHistory | [0:1] |
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. | X |
| 3 | Name | IfcLabel | [0:1] | 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. | X |
| 4 | Description | IfcText | [0:1] | Optional description, provided for exchanging informative comments. | X |
| # | Attribute | Type | Cardinality | Description | B |
|---|---|---|---|---|---|
| IfcRoot | |||||
| 1 | GlobalId | IfcGloballyUniqueId | [1:1] | Assignment of a globally unique identifier within the entire software world. | X |
| 2 | OwnerHistory | IfcOwnerHistory | [0:1] |
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. | X |
| 3 | Name | IfcLabel | [0:1] | 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. | X |
| 4 | Description | IfcText | [0:1] | Optional description, provided for exchanging informative comments. | X |
Software Identity
The Software Identity concept applies to this entity.
IfcRoot assigns the globally unique ID.
| Exchange |  |
 |
 |
 |
|---|---|---|---|---|
| Import | R | R | ||
| Export | R | R |
User Identity
The User Identity concept applies to this entity.
A name and a description can be used for all subypes of IfcRoot
| Exchange | |
|
|
|
|---|---|---|---|---|
| Import | O | O | ||
| Export | O | O |
Object Ownership
The Object Ownership concept applies to this entity.
Where multiple parties are responsible for the data content and digital signatures are applied as engineering stamps, such digital signatures then only refer to objects where IfcOwnerHistory.OwningUser matches the certificate issuer ("the entity that verified the information and issued the certificate") as described at https://en.wikipedia.org/wiki/Public_key_certificate.
| Exchange | |
|
|
|
|---|---|---|---|---|
| Import | O | O | O | O |
| Export | O | O | O | O |
| # | Concept | Model View |
|---|---|---|
| IfcRoot | ||
| Software Identity | Bridge View | |
| User Identity | Bridge View | |
| Object Ownership | Bridge View | |
Instance diagram <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>
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;
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