IFC 4.3.x development

8.17.3.7 IfcQuantityTime

Change log

IFC4

additionsattributesFormula

8.17.3.7.1 Semantic definitions at the entity

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.

EXAMPLE  The amount of time needed to pour concrete for a wall is given as a time quantity for the labor part of the recipe information.

HISTORY  New entity in IFC2x2.

8.17.3.7.1 Attributes

# Attribute Type Description
IfcPhysicalQuantity
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.
HasExternalReferencesSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.

> IFC4 CHANGE New inverse attribute.
PartOfComplex SET [0:1] OF IfcPhysicalComplexQuantity FOR HasQuantities Reference to a physical complex quantity in which the physical quantity may be contained.
IfcPhysicalSimpleQuantity
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.
IfcQuantityTime
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.

> IFC4 CHANGE Attribute added to the end of the attribute list.

8.17.3.7.2 Entity inheritance

dot_inheritance IfcQuantityTime IfcQuantityTime IfcPhysicalSimpleQuantity IfcPhysicalSimpleQuantity IfcQuantityTime->IfcPhysicalSimpleQuantity IfcPhysicalSimpleQuantity_children 5 more... IfcPhysicalSimpleQuantity_children->IfcPhysicalSimpleQuantity IfcPhysicalQuantity IfcPhysicalQuantity IfcPhysicalSimpleQuantity->IfcPhysicalQuantity IfcPhysicalComplexQuantity IfcPhysicalComplexQuantity IfcPhysicalComplexQuantity->IfcPhysicalQuantity

8.17.3.7.3 Formal representations

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