Natural language names
Simple physikalische Größe
Physical Simple Quantity
Quantité physique simple
Semantic definitions at the entity
Entity definition

The physical quantity, IfcPhysicalSimpleQuantity, is an entity that holds a single quantity measure value (as defined at the subtypes of IfcPhysicalSimpleQuantity) together with a semantic definition of the usage for the measure value.

EXAMPLE  An element, like a wall, may have several area measures, like footprint area, left wall face area, right wall face area. These areas would be given by three instances of the area quantity subtype, with different Name string values.

A section "Quantity Use Definition" at individual entities as subtypes of IfcBuildingElement gives guidance to the usage of the Name attribute to characterize the individual quantities. If the Unit attribute is given, the value attribute (introduced at the level of subtypes of IfcPhysicalSimpleQuantity) are given as quantities of this unit, otherwise the global unit definitions (given by IfcUnitAssignment) are used.

HISTORY  New entity in IFC2x2 Addendum 1.
IFC2x2 ADDENDUM 1 CHANGE  The abstract entity IfcPhysicalSimpleQuantity has been added. Upward compatibility for file based exchange is guaranteed.
Attribute definitions
#AttributeTypeCardinalityDescription R
3Unit- This attribute is out of scope for this model view definition and shall not be set.
Inherited definitions from supertypes
Entity inheritance IfcQuantityArea IfcQuantityCount IfcQuantityLength IfcQuantityTime IfcQuantityVolume IfcQuantityWeight IfcPhysicalQuantity
Attribute inheritance
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
S[0:1]Reference to a physical complex quantity in which the physical quantity may be contained.
3Unit- This attribute is out of scope for this model view definition and shall not be set.
Formal representations
XML Specification
 <xs:element name="IfcPhysicalSimpleQuantity" type="ifc:IfcPhysicalSimpleQuantity" abstract="true" substitutionGroup="ifc:IfcPhysicalQuantity" nillable="true"/>
 <xs:complexType name="IfcPhysicalSimpleQuantity" abstract="true">
   <xs:extension base="ifc:IfcPhysicalQuantity"/>
EXPRESS Specification
ENTITY IfcPhysicalSimpleQuantity
 ABSTRACT SUPERTYPE OF(ONEOF(IfcQuantityArea, IfcQuantityCount, IfcQuantityLength, IfcQuantityTime, IfcQuantityVolume, IfcQuantityWeight))
 SUBTYPE OF (IfcPhysicalQuantity);
  Unit : OPTIONAL IfcStrippedOptional;

Link to EXPRESS-G diagram EXPRESS-G diagram

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