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Definition from buildingSMART: A physical element quantity that defines a derived weight 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: The amount of reinforcement used within a building element may be measured according to its weight. The actual size of the weight 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 IfcQuantityWeight
SUBTYPE OF ( IfcPhysicalSimpleQuantity);
WeightValue  :  IfcMassMeasure;
WR21  :  NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.MASSUNIT);
WR22  :  WeightValue >= 0.;

Attribute definitions:

WeightValue  :  Mass measure value of this quantity.

Formal Propositions:

WR21  :  If a unit is given, the unit type shall be mass unit. NOTE: There is no distinction between the concept of "Mass" and "Weight" in the current IFC Release.
WR22  :  A valid weight quantity shall be greater than or equal to zero.

Inheritance graph

ENTITY IfcQuantityWeight;
ENTITY IfcPhysicalQuantity;
Name  :  IfcLabel;
Description  :  OPTIONAL IfcText;
PartOfComplex  :  SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities;
ENTITY IfcPhysicalSimpleQuantity;
Unit  :  OPTIONAL IfcNamedUnit;
ENTITY IfcQuantityWeight;
WeightValue  :  IfcMassMeasure;