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IfcConversionBasedUnit

Definition from ISO/CD 10303-41:1992: A conversion based unit is a unit that is defined based on a measure with unit.

NOTE: An inch is a converted unit. It is from the Imperial system, its name is "inch" and it can be related to the si unit, millimetre, through a measure with unit whose value is 25.4 millimetre. A foot is also a converted unit. It is from the Imperial system, its name is "foot" and it can be related to an si unit, millimetre, either directly or through the unit called "inch".
HISTORY This entity has changes after IFC Release 2.0.
ISSUE See issue and change log for issues and changes made in IFC Release 2x.

EXPRESS specification:

ENTITY IfcConversionBasedUnit
SUBTYPE OF ( IfcNamedUnit);
Name  :  IfcLabel;
ConversionFactor  :  IfcMeasureWithUnit;
END_ENTITY;

Attribute definitions:

Name  :  The word, or group of words, by which the conversion based unit is referred to.
ConversionFactor  :  The physical quantity from which the converted unit is derived.

References (1):

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

Inheritance graph

ENTITY IfcConversionBasedUnit;
ENTITY IfcNamedUnit;
Dimensions  :  IfcDimensionalExponents;
UnitType  :  IfcUnitEnum;
ENTITY IfcConversionBasedUnit;
Name  :  IfcLabel;
ConversionFactor  :  IfcMeasureWithUnit;
END_ENTITY;