#### 8.9.3.5 IfcNamedUnit

| Unité nommée
| Benannte Einheit

> NOTE Definition according to ISO/CD 10303-41:1992
> A named unit is a unit quantity associated with the word, or group of words, by which the unit is identified.

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

> HISTORY New type in IFC1.5.1.

XSD Specification:

<xs:element name="IfcNamedUnit" type="ifc:IfcNamedUnit" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcNamedUnit" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="Dimensions" type="ifc:IfcDimensionalExponents" nillable="true" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="UnitType" type="ifc:IfcUnitEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcNamedUnit

| ABSTRACT SUPERTYPE OF(ONEOF(IfcConversionBasedUnit, IfcSIUnit));

Dimensions | : | IfcDimensionalExponents;
UnitType | : | IfcUnitEnum;

| WHERE

WR1 | : | IfcCorrectDimensions (SELF.UnitType, SELF.Dimensions);

END_ENTITY;

Attribute Definitions:

Dimensions | : | The dimensional exponents of the SI base units by which the named unit is defined.
UnitType | : | The type of the unit.

Formal Propositions:

WR1 | : | Correct dimensions of the unit are established through the function IfcCorrectDimensions.

Inheritance Graph:

ENTITY IfcNamedUnit

| ENTITY IfcNamedUnit

Dimensions | : | IfcDimensionalExponents;
UnitType | : | IfcUnitEnum;

END_ENTITY;

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