IfcNamedUnit

Natural language names
Benannte Einheit
Named Unit
Unité nommée
Semantic definitions at the entity
Entity definition

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.

Attribute definitions
#AttributeTypeCardinalityDescription G
1DimensionsIfcDimensionalExponents The dimensional exponents of the SI base units by which the named unit is defined. X
2UnitTypeIfcUnitEnum The type of the unit. X
Formal Propositions
RuleDescription
WR1Correct dimensions of the unit are established through the function IfcCorrectDimensions.
Inherited definitions from supertypes
Entity inheritance IfcContextDependentUnit IfcConversionBasedUnit IfcSIUnit
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcNamedUnit
1DimensionsIfcDimensionalExponents The dimensional exponents of the SI base units by which the named unit is defined. X
2UnitTypeIfcUnitEnum The type of the unit. X
Formal representations
XML 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcDerivedUnitElement IfcUnit IfcPhysicalSimpleQuantity IfcProjectedCRS

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