IfcNamedUnit

8.5.3.6 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(IfcContextDependentUnit, 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

Dimensions	:	IfcDimensionalExponents;
UnitType	:	IfcUnitEnum;

END_ENTITY;

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