IfcQuantitySet

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcQuantitySet			ADDED

Semantic definitions at the entity

Entity definition

IfcQuantitySet is the the abstract supertype for all quantity sets attached to objects. The quantity set is a container class that holds the individual quantities within a quantity tree. These quantities are interpreted according to their name attribute and classified according to their measure type. Some quantity sets are included in the IFC specification and have a predefined set of quantities indicated by assigning a significant name. These quantity sets are listed as "quantity sets" within this specification. Quantity sets applicable to certain objects are listed in the object specification.

An IfcPropertySetTemplate may define the underlying structure, i.e. the required name, the applicable object or object types to which the quantity set can be attached, and the individual quantities that maybe included. Quantity 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.
Underlying template: IfcRelDefinesByTemplate using the inverse attribute IsDefinedBy.
External reference: subtypes of IfcRelAssociates are used to provide a link to a classification system, or external library providing further reference to the quantity set. Accessible by inverse attribute HasAssociations.

HISTORY New entity in IFC4.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	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
IfcPropertySetDefinition
	DefinesType	IfcTypeObject @HasPropertySets	S[0:?]	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.	X
	IsDefinedBy	IfcRelDefinesByTemplate @RelatedPropertySets	S[0:?]	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.	X
	DefinesOccurrence	IfcRelDefinesByProperties @RelatingPropertyDefinition	S[0:?]	Reference 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.	X
IfcQuantitySet

Definitions applying to Common Use Definitions

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions

Formal representations

XSD Specification

 <xs:element name="IfcQuantitySet" type="ifc:IfcQuantitySet" abstract="true" substitutionGroup="ifc:IfcPropertySetDefinition" nillable="true"/>

 <xs:complexType name="IfcQuantitySet" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcPropertySetDefinition"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcQuantitySet

 ABSTRACT SUPERTYPE OF(IfcElementQuantity)

 SUBTYPE OF (IfcPropertySetDefinition);

END_ENTITY;

 EXPRESS-G diagram

Link to this page

	frei definierbare Mengenliste
	Quantity Set
	Ensemble de quantités