Definiert durch Typ - Relation | |
Rel Defines By Type | |
Définition par type |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 4.0.0.0 |
---|---|---|---|---|
IfcRelDefinesByType | ||||
OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | IFC4 Addendum 2 4.0.2.0 | |
IfcRelDefinesByType | ||||
RelatedObjects | X | MODIFIED | Xsdformat changed from Default to Hidden. |
The objectified relationship IfcRelDefinesByType defines the relationship between an object type and object occurrences. The IfcRelDefinesByType is a 1-to-N relationship, as it allows for the assignment of one type information to a single or to many objects. Those objects then share the same object type, and the property sets and properties assigned to the object type.
The IfcRelDefinesByType links the object type definition with the object occurrence. Both may define properties by assigning an IfcPropertySet, including one or many subtypes of IfcProperty to either the object type or object occurrence, as shown in Figure 296.
There are several scenarios to define the same property set on the object type definition and object occurrence side:
Figure 296 — Type definition relationships |
The following table provides an example of assigning
properties assigned to IfcWall | properties assigned to IfcWallType | resulting property value for individual wall |
Pset_WallCommon | Pset_WallCommon | |
- ExtendToStructure = TRUE | TRUE | |
- ThermalTransmittance = 0.375 | 0.375 | |
- ExtendToStructure = FALSE | - ExtendToStructure = TRUE | FALSE |
HISTORY New entity in IFC2x.
IFC4 CHANGE The attribute RelatedObjects had been demoted from the supertype IfcRelDefines to IfcRelDefinesByType.
# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|
5 | RelatedObjects | IfcObject | S[1:?] | X | |
6 | RelatingType | IfcTypeObject | Reference to the type (or style) information for that object or set of objects. | X |
# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|
IfcRoot | |||||
1 | GlobalId | IfcGloballyUniqueId | Assignment of a globally unique identifier within the entire software world. | X | |
2 | OwnerHistory | IfcOwnerHistory | ? |
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. | X |
3 | Name | IfcLabel | ? | 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 | ? | Optional description, provided for exchanging informative comments. | X |
IfcRelationship | |||||
IfcRelDefines | |||||
IfcRelDefinesByType | |||||
5 | RelatedObjects | IfcObject | S[1:?] | X | |
6 | RelatingType | IfcTypeObject | Reference to the type (or style) information for that object or set of objects. | X |
# | Concept | Template | Model View |
---|---|---|---|
IfcRoot | |||
Identity | Software Identity | General Usage | |
Revision Control | Revision Control | General Usage |
<xs:element name="IfcRelDefinesByType" type="ifc:IfcRelDefinesByType" substitutionGroup="ifc:IfcRelDefines" nillable="true"/>
<xs:complexType name="IfcRelDefinesByType">
<xs:complexContent>
<xs:extension base="ifc:IfcRelDefines">
<xs:sequence>
<xs:element name="RelatingType" type="ifc:IfcTypeObject" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcRelDefinesByType
SUBTYPE OF (IfcRelDefines);
RelatedObjects : SET [1:?] OF IfcObject;
RelatingType : IfcTypeObject;
END_ENTITY;
References: IfcObject IfcTypeObject