IfcQuantityTime

Natural language names
Mengenangabe - Zeit
Quantity Time
Quantité de durée
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcQuantityTime
      FormulaADDED
Semantic definitions at the entity
Entity 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.

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.
Attribute definitions
#AttributeTypeCardinalityDescription G
4TimeValueIfcTimeMeasure Time measure value of this quantity.X
5FormulaIfcLabel? 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.
X
Formal Propositions
RuleDescription
WR21If a unit is given, the unit type shall be time unit.
WR22A valid weight quantity shall be greater than or equal to zero.
Inherited definitions from supertypes
Entity inheritance IfcPhysicalSimpleQuantity IfcPhysicalQuantity
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcPhysicalQuantity
1NameIfcLabel Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.X
2DescriptionIfcText? Further explanation that might be given to the quantity.X
HasExternalReferencesIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.
IFC4 CHANGE New inverse attribute.
X
PartOfComplexIfcPhysicalComplexQuantity
@HasQuantities
S[0:1]Reference to a physical complex quantity in which the physical quantity may be contained.X
IfcPhysicalSimpleQuantity
3UnitIfcNamedUnit? 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.X
IfcQuantityTime
4TimeValueIfcTimeMeasure Time measure value of this quantity.X
5FormulaIfcLabel? 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.
X
Formal representations
XML Specification
 <xs:element name="IfcQuantityTime" type="ifc:IfcQuantityTime" substitutionGroup="ifc:IfcPhysicalSimpleQuantity" nillable="true"/>
 <xs:complexType name="IfcQuantityTime">
  <xs:complexContent>
   <xs:extension base="ifc:IfcPhysicalSimpleQuantity">
    <xs:attribute name="TimeValue" type="ifc:IfcTimeMeasure" use="optional"/>
    <xs:attribute name="Formula" type="ifc:IfcLabel" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
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;

Link to EXPRESS-G diagram EXPRESS-G diagram

Link to this page  Link to this page