IfcPhysicalQuantity

Natural language names
Physikalische Größe
Physical Quantity
Quantité physique
Semantic definitions at the entity
Entity definition

The physical quantity, IfcPhysicalQuantity, is an abstract entity that holds a complex or simple quantity measure together with a semantic definition of the usage for the single or several measure value.

The Name attribute defines the actual usage or kind of measure. The interpretation of the name label has to be established within the actual exchange context. In addition an informative text may be associated to each quantity by the Description attribute.

HISTORY  New entity in IFC2x. It replaces the calcXxx attributes used in previous IFC Releases.

Attribute definitions
#AttributeTypeCardinalityDescription G
1NameIfcLabel Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements. X
2DescriptionIfcText? Further explanation that might be given to the quantity. X
HasExternalReferencesIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.
IFC4 CHANGE New inverse attribute.
X
PartOfComplexIfcPhysicalComplexQuantity
@HasQuantities
S[0:1]Reference to a physical complex quantity in which the physical quantity may be contained. X
Inherited definitions from supertypes
Entity inheritance IfcPhysicalComplexQuantity IfcPhysicalSimpleQuantity
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcPhysicalQuantity
1NameIfcLabel Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements. X
2DescriptionIfcText? Further explanation that might be given to the quantity. X
HasExternalReferencesIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.
IFC4 CHANGE New inverse attribute.
X
PartOfComplexIfcPhysicalComplexQuantity
@HasQuantities
S[0:1]Reference to a physical complex quantity in which the physical quantity may be contained. X
Formal representations
XML Specification
 <xs:element name="IfcPhysicalQuantity" type="ifc:IfcPhysicalQuantity" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>
 <xs:complexType name="IfcPhysicalQuantity" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:Entity">
    <xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
    <xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcPhysicalQuantity
 ABSTRACT SUPERTYPE OF(ONEOF(IfcPhysicalComplexQuantity, IfcPhysicalSimpleQuantity));
  Name : IfcLabel;
  Description : OPTIONAL IfcText;
 INVERSE
  HasExternalReferences : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
  PartOfComplex : SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElementQuantity IfcCostItem IfcConstructionResource IfcConstructionResourceType IfcResourceObjectSelect IfcPhysicalComplexQuantity

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