#### 8.9.3.4 IfcMeasureWithUnit

| Mesure avec unité
| Maß mit Einheit

> NOTE Definition according to ISO/CD 10303-41:1992
> A measure with unit is the specification of a physical quantity as defined in ISO 31 (clause 2).

IfcMeasureWithUnit has two usages:
1. For representing measure value together with its unit on the entity type attribute level; thus overriding the IFC model global unit assignments.
2. For conversion based unit to give the conversion rate and its base.

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

> HISTORY New entity in IFC1.5.1.

XSD Specification:

<xs:element name="IfcMeasureWithUnit" type="ifc:IfcMeasureWithUnit" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcMeasureWithUnit">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="ValueComponent">
<xs:complexType>
<xs:group ref="ifc:IfcValue"/>
</xs:complexType>
</xs:element>
<xs:element name="UnitComponent">
<xs:complexType>
<xs:group ref="ifc:IfcUnit"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcMeasureWithUnit;

ValueComponent | : | IfcValue;
UnitComponent | : | IfcUnit;

END_ENTITY;

Attribute Definitions:

ValueComponent | : | The value of the physical quantity when expressed in the specified units.
UnitComponent | : | The unit in which the physical quantity is expressed.

Inheritance Graph:

ENTITY IfcMeasureWithUnit

| ENTITY IfcMeasureWithUnit

ValueComponent | : | IfcValue;
UnitComponent | : | IfcUnit;

END_ENTITY;

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