IfcQuantityWeight

Natural language names
Mengenangabe - Gewicht
Quantity Weight
Quantité de poids
Change log
ItemSPFXMLChangeDescription
4.0.0.0
    IfcQuantityWeight
      FormulaADDED
Semantic definitions at the entity
Entity definition

IfcQuantityWeight is a physical element quantity that defines a derived weight 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.

EXAMPLE  The amount of reinforcement used within a building element may be measured according to its weight. The actual size of the weight depends on the method of measurement used.
HISTORY  New entity in IFC2x. It replaces the calcXxx attributes used in previous IFC Releases.
Attribute definitions
#AttributeTypeCardinalityDescription G
4WeightValueIfcMassMeasure Mass 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 mass unit. NOTE  There is no distinction between the concept of "Mass" and "Weight" in the current IFC Release.
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
IfcQuantityWeight
4WeightValueIfcMassMeasure Mass 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="IfcQuantityWeight" type="ifc:IfcQuantityWeight" substitutionGroup="ifc:IfcPhysicalSimpleQuantity" nillable="true"/>
 <xs:complexType name="IfcQuantityWeight">
  <xs:complexContent>
   <xs:extension base="ifc:IfcPhysicalSimpleQuantity">
    <xs:attribute name="WeightValue" type="ifc:IfcMassMeasure" use="optional"/>
    <xs:attribute name="Formula" type="ifc:IfcLabel" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcQuantityWeight
 SUBTYPE OF (IfcPhysicalSimpleQuantity);
  WeightValue : IfcMassMeasure;
  Formula : OPTIONAL IfcLabel;
 WHERE
  WR21 : NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR
(SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.MASSUNIT);
  WR22 : WeightValue >= 0.;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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