IFC 4.3.2.20250327 (IFC4X3_ADD2) under development

5.1.3.19 IfcQuantitySet

RV ⓘ
AbV ⓘ

ABSTRACT This definition may not be instantiated

5.1.3.19.1 Semantic 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.

5.1.3.19.2 Entity inheritance

5.1.3.19.3 Attributes

# Attribute Type Description
IfcRoot (4)
IfcPropertyDefinition (2)
Click to show 6 hidden inherited attributes
IfcPropertySetDefinition (3)
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.

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.

DefinesOccurrence SET [0:?] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition

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.

Table 5.1.3.19.A

5.1.3.19.4 Concept usage

Concept Usage Description
IfcRoot (2)
Click to show 2 hidden inherited concepts
Table 5.1.3.19.B

5.1.3.19.5 Formal representation

ENTITY IfcQuantitySet
ABSTRACT SUPERTYPE OF (ONEOF
(IfcElementQuantity))
SUBTYPE OF (IfcPropertySetDefinition);
END_ENTITY;

5.1.3.19.6 References

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5.1.3.19.7 Changelog

5.1.3.19.7.1 IFC4

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