#### 8.5.2.9 IfcUnit

> NOTE Definition according to ISO/CD 10303-41:1992
> A unit is a physical quantity, with a value of one, which is used as a standard in terms of which other quantities are expressed.

> NOTE Select item IfcMonetaryUnit is an addition to ISO 10303-41.

> NOTE Corresponding ISO 10303 name: unit, please refer to ISO/IS 10303-41 for the final definition of the formal standard.

SELECT

- IfcNamedUnit: A unit which is identified by a name.
- IfcDerivedUnit: A unit which is derived from an expression of units.
- IfcMonetaryUnit: A unit for defining currencies.

> HISTORY New type in IFC1.5.1.

XSD Specification:

<xs:group name="IfcUnit">
<xs:choice>
<xs:element ref="ifc:IfcNamedUnit"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcUnit = SELECT (
| IfcNamedUnit);
END_TYPE;

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