IfcContextDependentUnit

IfcContextDependentUnit

实体定义
注：定义依据ISO/CD 10303-41:1992
上下文相关单位是指与国际单位制无关的单位。
注：组件中的零件数量是以单位测量的物理量，可以称为“零件”，但不能与国际单位制相关。
注：对应的ISO 10303名称：context_dependent_unit，正式标准的最终定义请参考ISO/IS 10303-41。
IFC1.5.1中的新实体。

 

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
3	Name	IfcLabel	[1:1]	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.	X

 

 

Formal representations

 

 Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcNamedUnit
1	Dimensions	IfcDimensionalExponents	[1:1]	The dimensional exponents of the SI base units by which the named unit is defined.	X
2	UnitType	IfcUnitEnum	[1:1]	The type of the unit.	X
IfcContextDependentUnit
3	Name	IfcLabel	[1:1]	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.	X

 

 

EXPRESS Specification

ENTITY IfcContextDependentUnit
 SUBTYPE OF (IfcNamedUnit);
  Name : IfcLabel;
 INVERSE
  HasExternalReference : SET OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
END_ENTITY;

 

 

 

 

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