IfcUnit

BACnet MVD

#### IfcUnit

Natural language names

| Einheit
| Unit
| Unité

##### Semantic definitions at the type

Type definition

> 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.

Select definition

Type | Description
--- | ---
IfcDerivedUnit |
IfcNamedUnit |
IfcMonetaryUnit |

##### Formal representations

XML Specification
`<xs:group name="IfcUnit">
<xs:choice>
<xs:element ref="ifc:IfcDerivedUnit"/>
<xs:element ref="ifc:IfcMonetaryUnit"/>
<xs:element ref="ifc:IfcNamedUnit"/>
</xs:choice>
</xs:group>
`
EXPRESS Specification
`TYPE IfcUnit = SELECT (
IfcDerivedUnit,
IfcNamedUnit,
IfcMonetaryUnit);
END_TYPE;

EXPRESS-G diagram

`

References: IfcSimplePropertyTemplate IfcTimeSeries IfcMeasureWithUnit IfcUnitAssignment IfcPropertyBoundedValue IfcPropertyEnumeration IfcPropertyListValue IfcPropertySingleValue IfcPropertyTableValue IfcTableColumn

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