IFC 4.3.x development

5.1.3.8 IfcPreDefinedPropertySet

Change log

IFC4

added

5.1.3.8.1 Semantic definitions at the entity

IfcPreDefinedPropertySet is a generalization of all statically defined property sets that are assigned to an object or type object. The statically or pre-defined property sets are entities with a fixed list of attributes having particular defined data types.

Property sets are related to other objects by using the relationship object that refers to the corresponding object:

  • Occurrence Object: IfcRelDefinesByProperties using the inverse attribute DefinesOccurrence.
  • Type Object: using a direct link by inverse attribute DefinesType.

IfcPreDefinedPropertySet's can be assigned to objects and object types but do not have a defining property set template.

HISTORY  New entity in IFC4

# Attribute Type Description
IfcRoot
1 GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2 OwnerHistory OPTIONAL 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.
3 Name OPTIONAL 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.
4 Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcPropertyDefinition
HasContext SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions
HasAssociations SET [0:?] OF IfcRelAssociates FOR RelatedObjects 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.
IfcPropertySetDefinition
DefinesType SET [0:?] OF IfcTypeObject FOR HasPropertySets The type object to which the property set is assigned. The property set acts as a shared property set to all occurrences of the type object.

> NOTE  The relationship between the IfcPropertySetDefinition and the IfcTypeObject is a direct relationship, not utilizing IfcRelDefinesByProperties, for maintaining compatibility with earlier releases of this standard.

> IFC4 CHANGE  The cardinality has been changed from 0:1 to 0:? with upward compatibility for file based exchange.
IsDefinedBy SET [0:?] OF IfcRelDefinesByTemplate FOR RelatedPropertySets Relation to the property set template, via the objectified relationship IfcRelDefinesByTemplate, that, if given, provides the definition template for the property set or quantity set and its properties.

> IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
DefinesOccurrenceSET [0:?] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinitionReference to the relation to one or many object occurrences that are characterized by the property set definition. A single property set can be assigned to multiple object occurrences using the objectified relationship IfcRefDefinesByProperties.

> IFC4 CHANGE Inverse attribute renamed from PropertyDefinitionOf with upward compatibility for file-based exchange.

5.1.3.8.1 Entity inheritance

dot_inheritance IfcPreDefinedPropertySet_children 5 more... IfcPreDefinedPropertySet IfcPreDefinedPropertySet IfcPreDefinedPropertySet_children->IfcPreDefinedPropertySet IfcPropertySetDefinition IfcPropertySetDefinition IfcPreDefinedPropertySet->IfcPropertySetDefinition IfcPropertySet IfcPropertySet IfcPropertySet->IfcPropertySetDefinition IfcPropertyDefinition IfcPropertyDefinition IfcPropertySetDefinition->IfcPropertyDefinition IfcQuantitySet IfcQuantitySet IfcQuantitySet->IfcPropertySetDefinition IfcPropertyTemplateDefinition IfcPropertyTemplateDefinition IfcPropertyTemplateDefinition->IfcPropertyDefinition IfcRoot IfcRoot IfcPropertyDefinition->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcRelationship IfcRelationship IfcRelationship->IfcRoot

5.1.3.8.2 Definitions applying to General Usage

5.1.3.8.2.1 Identity

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

5.1.3.8.2.2 Revision Control

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

5.1.3.8.3 Formal representations

ENTITY IfcPreDefinedPropertySet
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcDoorLiningProperties
	,IfcDoorPanelProperties
	,IfcPermeableCoveringProperties
	,IfcReinforcementDefinitionProperties
	,IfcWindowLiningProperties
	,IfcWindowPanelProperties))
 SUBTYPE OF (IfcPropertySetDefinition);
END_ENTITY;