IfcContextDependentUnit

Semantic definitions at the entity

Entity definition

NOTE Definition according to ISO/CD 10303-41:1992
A context dependent unit is a unit which is not related to the SI system.

NOTE The number of parts in an assembly is a physical quantity measured in units that may be called "parts" but which cannot be related to an SI unit.

NOTE Corresponding ISO 10303 name: context_dependent_unit, 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	G
3	Name	IfcLabel		The word, or group of words, by which the context dependent unit is referred to.	X
	HasExternalReference	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to external information, e.g. library, classification, or document information, which is associated with the context dependent unit. IFC4 CHANGE New inverse attribute	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcNamedUnit
1	Dimensions	IfcDimensionalExponents		The dimensional exponents of the SI base units by which the named unit is defined.	X
2	UnitType	IfcUnitEnum		The type of the unit.	X
IfcContextDependentUnit
3	Name	IfcLabel		The word, or group of words, by which the context dependent unit is referred to.	X
	HasExternalReference	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to external information, e.g. library, classification, or document information, which is associated with the context dependent unit. IFC4 CHANGE New inverse attribute	X

Formal representations

XML Specification

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

 <xs:complexType name="IfcContextDependentUnit">

  <xs:complexContent>

   <xs:extension base="ifc:IfcNamedUnit">

    <xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcContextDependentUnit

 SUBTYPE OF (IfcNamedUnit);

  Name : IfcLabel;

 INVERSE

  HasExternalReference : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;

END_ENTITY;

 EXPRESS-G diagram

	Kontextabhängige Einheit
	Context Dependent Unit
	Unité dépendant du contexte