IfcQuantityLength is a physical quantity that defines a derived length 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.
Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.
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.
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.
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Length measure value of this quantity.
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.
If a unit is given, the unit type shall be a length unit.
A valid length quantity shall be greater than or equal to zero.
ENTITY IfcQuantityLength SUBTYPE OF (IfcPhysicalSimpleQuantity); LengthValue : IfcLengthMeasure; Formula : OPTIONAL IfcLabel; WHERE WR21 : NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.LENGTHUNIT); WR22 : LengthValue >= 0.; END_ENTITY;