IFC (IFC4X3_ADD2) under development IfcPhysicalComplexQuantity Semantic definition

The complex physical quantity, IfcPhysicalComplexQuantity, is an entity that holds a set of single quantity measure value (as defined at the subtypes of IfcPhysicalSimpleQuantity), that all apply to a given component or aspect of the element.

A section "Quantity Use Definition" at individual entities as subtypes of IfcBuiltElement gives guidance to the usage of the Name and Discrimination attribute to characterize the complex quantities. Entity inheritance Attributes

# Attribute Type Description
IfcPhysicalQuantity (4)
1 Name IfcLabel

Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.

2 Description OPTIONAL IfcText

Further explanation that might be given to the quantity.

HasExternalReferences SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects

Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.

PartOfComplex SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities

Reference to a physical complex quantity in which the physical quantity may be contained.

Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcPhysicalComplexQuantity (4)
3 HasQuantities SET [1:?] OF IfcPhysicalQuantity

Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination.

4 Discrimination IfcLabel

Identification of the discrimination by which this physical complex property is distinguished. Examples of discriminations are 'layer', 'steel bar diameter', etc.

5 Quality OPTIONAL IfcLabel

Additional indication of a quality of the quantities that are grouped under this physical complex quantity.

6 Usage OPTIONAL IfcLabel

Additional indication of a usage type of the quantities that are grouped under this physical complex quantity.

Table Formal propositions

Name Description

The IfcPhysicalComplexQuantity should not reference itself within the list of HasQuantities.

SIZEOF(QUERY(temp <* HasQuantities | SELF :=: temp)) = 0

Every individual IfcPhysicalQuantity within the set HasQuantities shall have a unique Name attribute value.

Table Formal representation

ENTITY IfcPhysicalComplexQuantity
 SUBTYPE OF (IfcPhysicalQuantity);
	HasQuantities : SET [1:?] OF IfcPhysicalQuantity;
	Discrimination : IfcLabel;
	Quality : OPTIONAL IfcLabel;
	Usage : OPTIONAL IfcLabel;
	NoSelfReference : SIZEOF(QUERY(temp <* HasQuantities | SELF :=: temp)) = 0;
	UniqueQuantityNames : IfcUniqueQuantityNames(HasQuantities);
END_ENTITY; References

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Is this page difficult to understand? Let us know! Changelog IFC4

  • where rule, NoSelfReference
  • where rule, UniqueQuantityNames
  • where rule, WR21