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IfcQuantityWeight

Definition from IAI: 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
NOTE: It replaces the calcXxx attributes used in previous IFC Releases
ISSUE See issues for changes made in IFC Release 2.x


EXPRESS specification:

ENTITY IfcQuantityWeight
SUBTYPE OF ( IfcPhysicalQuantity);
WeightValue  :  IfcMassMeasure;
WHERE
WR1  :  NOT(EXISTS(SELF\IfcPhysicalQuantity.Unit)) OR (SELF\IfcPhysicalQuantity.Unit.UnitType = IfcUnitEnum.MASSUNIT);
END_ENTITY;

Attribute definitions:

WeightValue  :  Mass measure value of this quantity.

Formal Propositions:

WR1  :  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.

References (1):

Name Type Referred through Express-G
IfcPhysicalQuantity Entity
Subtype
Diagram 1

Inheritance graph

ENTITY IfcQuantityWeight;
ENTITY IfcPhysicalQuantity;
Name  :  IfcLabel;
Description  :  OPTIONAL IfcText;
Unit  :  OPTIONAL IfcNamedUnit;
ENTITY IfcQuantityWeight;
WeightValue  :  IfcMassMeasure;
END_ENTITY;