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Definition from buildingSMART: A physical quantity that defines a derived volume measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.

EXAMPLE: A thick brick wall may be measured according to its volume. The actual size of the volume depends on the method of measurement used.

HISTORY New entity in IFC Release 2.x. It replaces the calcXxx attributes used in previous IFC Releases.

EXPRESS specification:

ENTITY IfcQuantityVolume
SUBTYPE OF ( IfcPhysicalSimpleQuantity);
VolumeValue  :  IfcVolumeMeasure;
WR21  :  NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.VOLUMEUNIT);
WR22  :  VolumeValue >= 0.;

Attribute definitions:

VolumeValue  :  Volume measure value of this quantity.

Formal Propositions:

WR21  :  If a unit is given, the unit type shall be volume unit.
WR22  :  A valid volume quantity shall be greater than or equal to zero.

Inheritance graph

ENTITY IfcQuantityVolume;
ENTITY IfcPhysicalQuantity;
Name  :  IfcLabel;
Description  :  OPTIONAL IfcText;
PartOfComplex  :  SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities;
ENTITY IfcPhysicalSimpleQuantity;
Unit  :  OPTIONAL IfcNamedUnit;
ENTITY IfcQuantityVolume;
VolumeValue  :  IfcVolumeMeasure;