#### 8.7.2.1 IfcPhysicalQuantity

| Quantité physique
| Physikalische Größe

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.

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;

Attribute Definitions:

Name | : | Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.
Description | : | Further explanation that might be given to the quantity.

Inheritance Graph:

ENTITY IfcPhysicalQuantity

| ENTITY IfcPhysicalQuantity

Name | : | IfcLabel;
Description | : | OPTIONAL IfcStrippedOptional;

| INVERSE

END_ENTITY;

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