IFC 4.3.0.1 (IFC4X3) development

8.17.3.3 IfcPhysicalSimpleQuantity

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 IfcBuildingElement 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.

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;