IfcMeasureWithUnit

BACnet MVD

#### IfcMeasureWithUnit

Natural language names

| Maß mit Einheit
| Measure With Unit
| Mesure avec unité

##### Semantic definitions at the entity

Entity definition

> 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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | ValueComponent | IfcValue |  | The value of the physical quantity when expressed in the specified units. |  | X
2 | UnitComponent | IfcUnit |  | The unit in which the physical quantity is expressed. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcMeasureWithUnit
1 | ValueComponent | IfcValue |  | The value of the physical quantity when expressed in the specified units. |  | X
2 | UnitComponent | IfcUnit |  | The unit in which the physical quantity is expressed. |  | X

##### Formal representations

XML 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;

EXPRESS-G diagram

`

References: IfcRelAssignsToProcess IfcMetricValueSelect IfcAppliedValue IfcAppliedValueSelect IfcConversionBasedUnit

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