IFC (IFC4X3_ADD2) development IfcQuantityTime

AbRV ⓘ
RV ⓘ Semantic definition

IfcQuantityTime is an element quantity that defines a time measure to provide a property of time related to an element. It is normally given by the recipe information of the element under the specific measure rules given by a method of measurement. 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.

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
IfcQuantityTime (2)
4 TimeValue IfcTimeMeasure

Time 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 Formal propositions

Name Description

If a unit is given, the unit type shall be time unit.

NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR
   (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.TIMEUNIT)

A valid weight quantity shall be greater than or equal to zero.

TimeValue >= 0.
Table Formal representation

ENTITY IfcQuantityTime
 SUBTYPE OF (IfcPhysicalSimpleQuantity);
	TimeValue : IfcTimeMeasure;
	Formula : OPTIONAL IfcLabel;
	WR21 : NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR
   (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.TIMEUNIT);
	WR22 : TimeValue >= 0.;
END_ENTITY; References

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  • attribute, Formula