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IfcQuantityArea

Definition from IAI: A physical quantity, IfcQuantityArea, that defines a derived area 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: An opening may have an opening area used to deduct it from the wall surface area. The actual size of the area 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 issue and change log for changes made in IFC Release 2.x

EXPRESS specification:

ENTITY IfcQuantityArea
SUBTYPE OF ( IfcPhysicalQuantity);
AreaValue  :  IfcAreaMeasure;
WHERE
WR1  :  NOT(EXISTS(SELF\IfcPhysicalQuantity.Unit)) OR (SELF\IfcPhysicalQuantity.Unit.UnitType = IfcUnitEnum.AREAUNIT);
END_ENTITY;

Attribute definitions:

AreaValue  :  Area measure value of this quantity.

Formal Propositions:

WR1  :  If a unit is given, the unit type shall be area unit.

References (1):

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

Inheritance graph

ENTITY IfcQuantityArea;
ENTITY IfcPhysicalQuantity;
Name  :  IfcLabel;
Description  :  OPTIONAL IfcText;
Unit  :  OPTIONAL IfcNamedUnit;
ENTITY IfcQuantityArea;
AreaValue  :  IfcAreaMeasure;
END_ENTITY;