IfcPhysicalQuantity

物理量IfcPhysicalQuantity是一个抽象的实体，它包含一个复杂或简单的量的度量，以及一个或多个度量值的用法的语义定义。

Name属性定义度量的实际用法或种类。名称标签的解释必须在实际的交换上下文中建立。此外，信息文本可通过描述属性与每个量相关联。

IFC2x中增加的新实体。它替换了以前IFC版本中使用的calcXxx属性。

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcPhysicalQuantity
1	Name	IfcLabel	[1:1]	Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.	X
2	Description	IfcText	[0:1]	Further explanation that might be given to the quantity.	X
	HasExternalReferences	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.	X
	PartOfComplex	IfcPhysicalComplexQuantity @HasQuantities	S[0:1]	Reference to a physical complex quantity in which the physical quantity may be contained.	X

 

EXPRESS Specification

ENTITY IfcPhysicalQuantity
 ABSTRACT SUPERTYPE OF(ONEOF(IfcPhysicalComplexQuantity, IfcPhysicalSimpleQuantity));
  Name : IfcLabel;
  Description : OPTIONAL IfcText;
 INVERSE
  HasExternalReferences : SET OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
  PartOfComplex : SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities;
END_ENTITY;