IfcDerivedUnitElement

Semantic definitions at the entity

Entity definition

NOTE Definition according to ISO/CD 10303-41:1992
A derived unit element is one of the unit quantities which makes up a derived unit.

EXAMPLE Newtons per square millimetre is a derived unit. It has two elements, Newton whose exponent has a value of 1 and millimetre whose exponent is -2.

NOTE Corresponding ISO 10303 name: derived_unit_element, 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	Unit	IfcNamedUnit	[1:1]	The fixed quantity which is used as the mathematical factor.	X
2	Exponent	INTEGER	[1:1]	The power that is applied to the unit attribute.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcDerivedUnitElement
1	Unit	IfcNamedUnit	[1:1]	The fixed quantity which is used as the mathematical factor.	X
2	Exponent	INTEGER	[1:1]	The power that is applied to the unit attribute.	X

Formal representations

XSD Specification

 <xs:element name="IfcDerivedUnitElement" type="ifc:IfcDerivedUnitElement" substitutionGroup="ifc:Entity" nillable="true"/>

 <xs:complexType name="IfcDerivedUnitElement">

  <xs:complexContent>

   <xs:extension base="ifc:Entity">

    <xs:sequence>

     <xs:element name="Unit" type="ifc:IfcNamedUnit" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="Exponent" type="xs:long" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcDerivedUnitElement;

  Unit : IfcNamedUnit;

  Exponent : INTEGER;

END_ENTITY;

 EXPRESS-G diagram

	Abgeleitete Einheit - Element
	Derived Unit Element
	Elément d'unité dérivée