8.17.3.3 IfcPhysicalSimpleQuantity

RV ⓘ

AbV ⓘ

ABSTRACT This definition may not be instantiated

8.17.3.3.1 Semantic definition

The physical quantity, IfcPhysicalSimpleQuantity, is an entity that holds a single quantity measure value (as defined at the subtypes of IfcPhysicalSimpleQuantity) together with a semantic definition of the usage for the measure value.

A section "Quantity Use Definition" at individual entities as subtypes of IfcBuiltElement gives guidance to the usage of the Name attribute to characterize the individual quantities. If the Unit attribute is given, the value attribute (introduced at the level of subtypes of IfcPhysicalSimpleQuantity) are given as quantities of this unit, otherwise the global unit definitions (given by IfcUnitAssignment) are used.

{ .change-ifc2x2}

8.17.3.3.2 Entity inheritance

8.17.3.3.3 Attributes

#	Attribute	Type	Description
IfcPhysicalQuantity (4)
1	Name	IfcLabel	Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.
2	Description	OPTIONAL IfcText	Further explanation that might be given to the quantity.
	HasExternalReferences	SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects	Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity. IFC4-CHANGE New inverse attribute.
	PartOfComplex	SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities	Reference to a physical complex quantity in which the physical quantity may be contained.
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcPhysicalSimpleQuantity (1)
3	Unit	OPTIONAL IfcNamedUnit	Optional assignment of a unit. If no unit is given, then the global unit assignment, as established at the IfcProject, applies to the quantity measures.

Table A

8.17.3.3.4 Formal representation

ENTITY IfcPhysicalSimpleQuantity
ABSTRACT SUPERTYPE OF (ONEOF
(IfcQuantityArea
,IfcQuantityCount
,IfcQuantityLength
,IfcQuantityNumber
,IfcQuantityTime
,IfcQuantityVolume
,IfcQuantityWeight))
SUBTYPE OF (IfcPhysicalQuantity);
Unit : OPTIONAL IfcNamedUnit;
END_ENTITY;