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.
|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.|
> 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.|
|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.|
|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.
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;