Merkmal - Definition | |
Property Definition | |
Définition de propriété |
IfcPropertyDefinition defines the generalization of all characteristics (i.e. a grouping of individual properties), that may be assigned to objects. Currently, subtypes of IfcPropertyDefinition include property set occurrences, property set templates, and property templates.
NOTE The subtype hierarchy of IfcPropertyDefinition also includes statically defined property sets as IfcPreDefinedPropertySet. Those are rarely used collections of fixed attributes combined in an entity definition. The IfcPreDefinedPropertySet can not be determined by an IfcPropertySetTemplate.
NOTE Individual properties, (subtypes of IfcProperty), are currently not included in the subtype hierarchy of IfcPropertyDefinition. This anomaly is due to upward compatibility reasons with earlier releases of this standard.
Property definitions define information that is shared among multiple instances of objects, either object occurrences or object types. IfcPropertyDefinition's (by their instantiable subtypes) can participate within the following relationships:
Subtypes are included in more specific relationships, see IfcPropertySetDefinition and IfcPropertyTemplateDefinition for details.
HISTORY New entity in IFC2.0
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] | X | ||
HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition. | X |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
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 |
IfcPropertyDefinition | |||||
HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] | X | ||
HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition. | X |
# | Concept | Model View |
---|---|---|
IfcRoot | ||
Software Identity | Common Use Definitions | |
Revision Control | Common Use Definitions |
<xs:element name="IfcPropertyDefinition" type="ifc:IfcPropertyDefinition" abstract="true" substitutionGroup="ifc:IfcRoot" nillable="true"/>
<xs:complexType name="IfcPropertyDefinition" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcRoot"/>
</xs:complexContent>
</xs:complexType>
ENTITY IfcPropertyDefinition
ABSTRACT SUPERTYPE OF(ONEOF(IfcPropertySetDefinition, IfcPropertyTemplateDefinition))
SUBTYPE OF (IfcRoot);
INVERSE
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
END_ENTITY;