#### IfcPhysicalQuantity

Natural language names

##### 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 IFC Release 2.x. It replaces the calcXxx attributes used in previous IFC Releases.

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
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 | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
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 | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Formal representations

XSD 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:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcPhysicalQuantity
ABSTRACT SUPERTYPE OF(IfcPhysicalSimpleQuantity);
Name : IfcLabel;
Description : OPTIONAL IfcStrippedOptional;
INVERSE
END_ENTITY;

EXPRESS-G diagram

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