IFC 4.3.1.0 (IFC4X3_ADD1)

8.17.3.5 IfcQuantityCount

8.17.3.5.1 Semantic definition

IfcQuantityCount is a physical quantity that defines a derived count measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.

8.17.3.5.2 Entity inheritance

8.17.3.5.3 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.

IfcPhysicalSimpleQuantity (1)
3 Unit OPTIONAL IfcNamedUnit

Optional assignment of a unit. If no unit is given, then the global unit assignment, as established at the IfcProject, applies to the quantity measures.

Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes
IfcQuantityCount (2)
4 CountValue IfcCountMeasure

Count measure value of this quantity.

5 Formula OPTIONAL IfcLabel

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

Table 8.17.3.5.A

8.17.3.5.4 Formal propositions

Name Description
WR21

The value of the count shall be greater than or equal to zero.

CountValue >= 0
Table 8.17.3.5.B

8.17.3.5.5 Formal representation

ENTITY IfcQuantityCount
 SUBTYPE OF (IfcPhysicalSimpleQuantity);
	CountValue : IfcCountMeasure;
	Formula : OPTIONAL IfcLabel;
 WHERE
	WR21 : CountValue >= 0;
END_ENTITY;

8.17.3.5.6 References

8.17.3.5.7 Changelog

8.17.3.5.7.1 IFC4

  • attribute, Formula

8.17.3.5.7.2 IFC4.3_ADD1

  • where rule, WR21
  • where rule, WR21