IfcDimensionalExponents

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

#	Attribute	Type	Cardinality	Description	C
1	LengthExponent	INTEGER	[1:1]	The power of the length base quantity.	X
2	MassExponent	INTEGER	[1:1]	The power of the mass base quantity.	X
3	TimeExponent	INTEGER	[1:1]	The power of the time base quantity.	X
4	ElectricCurrentExponent	INTEGER	[1:1]	The power of the electric current base quantity.	X
5	ThermodynamicTemperatureExponent	INTEGER	[1:1]	The power of the thermodynamic temperature base quantity.	X
6	AmountOfSubstanceExponent	INTEGER	[1:1]	The power of the amount of substance base quantity.	X
7	LuminousIntensityExponent	INTEGER	[1:1]	The power of the luminous intensity base quantity.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcDimensionalExponents
1	LengthExponent	INTEGER	[1:1]	The power of the length base quantity.	X
2	MassExponent	INTEGER	[1:1]	The power of the mass base quantity.	X
3	TimeExponent	INTEGER	[1:1]	The power of the time base quantity.	X
4	ElectricCurrentExponent	INTEGER	[1:1]	The power of the electric current base quantity.	X
5	ThermodynamicTemperatureExponent	INTEGER	[1:1]	The power of the thermodynamic temperature base quantity.	X
6	AmountOfSubstanceExponent	INTEGER	[1:1]	The power of the amount of substance base quantity.	X
7	LuminousIntensityExponent	INTEGER	[1:1]	The power of the luminous intensity base quantity.	X

Formal representations

XSD 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;

 EXPRESS-G diagram

	Dimensionale Exponenten
	Dimensional Exponents
	exposants dimensionnels