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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