IfcDimensionalExponents

Natural language names
Dimensionale Exponenten
Dimensional Exponents
exposants dimensionnels
Semantic definitions at the entity
Entity definition

NOTE  Definition according to ISO/CD 10303-41:1992
The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical quantities are founded on seven base quantities (ISO 31 (clause 2)).

NOTE  Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities.

EXAMPLE  A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0.

EXAMPLE  A velocity of 2 millimetres per second has a length exponent of 1 and a time exponent of -1. The remaining exponents are equal to 0.

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

HISTORY  New entity in IFC1.5.1.

Attribute definitions
#AttributeTypeCardinalityDescription G
1LengthExponentINTEGER The power of the length base quantity. X
2MassExponentINTEGER The power of the mass base quantity. X
3TimeExponentINTEGER The power of the time base quantity. X
4ElectricCurrentExponentINTEGER The power of the electric current base quantity. X
5ThermodynamicTemperatureExponentINTEGER The power of the thermodynamic temperature base quantity. X
6AmountOfSubstanceExponentINTEGER The power of the amount of substance base quantity. X
7LuminousIntensityExponentINTEGER The power of the luminous intensity base quantity. X
Inherited definitions from supertypes
Entity inheritance
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcDimensionalExponents
1LengthExponentINTEGER The power of the length base quantity. X
2MassExponentINTEGER The power of the mass base quantity. X
3TimeExponentINTEGER The power of the time base quantity. X
4ElectricCurrentExponentINTEGER The power of the electric current base quantity. X
5ThermodynamicTemperatureExponentINTEGER The power of the thermodynamic temperature base quantity. X
6AmountOfSubstanceExponentINTEGER The power of the amount of substance base quantity. X
7LuminousIntensityExponentINTEGER The power of the luminous intensity base quantity. X
Formal representations
XML Specification
 <xs:element name="IfcDimensionalExponents" type="ifc:IfcDimensionalExponents" substitutionGroup="ifc:Entity" nillable="true"/>
 <xs:complexType name="IfcDimensionalExponents">
  <xs:complexContent>
   <xs:extension base="ifc:Entity">
    <xs:attribute name="LengthExponent" type="xs:long" use="optional"/>
    <xs:attribute name="MassExponent" type="xs:long" use="optional"/>
    <xs:attribute name="TimeExponent" type="xs:long" use="optional"/>
    <xs:attribute name="ElectricCurrentExponent" type="xs:long" use="optional"/>
    <xs:attribute name="ThermodynamicTemperatureExponent" type="xs:long" use="optional"/>
    <xs:attribute name="AmountOfSubstanceExponent" type="xs:long" use="optional"/>
    <xs:attribute name="LuminousIntensityExponent" type="xs:long" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcDimensionalExponents;
  LengthExponent : INTEGER;
  MassExponent : INTEGER;
  TimeExponent : INTEGER;
  ElectricCurrentExponent : INTEGER;
  ThermodynamicTemperatureExponent : INTEGER;
  AmountOfSubstanceExponent : INTEGER;
  LuminousIntensityExponent : INTEGER;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcDerivedUnit IfcNamedUnit IfcSIUnit

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