IfcPhysicalComplexQuantity
Definition from IAI: The complex physical quantity,
IfcPhysicalComplexQuantity, is an entity that holds a set of single
quantity measure value (as defined at the subtypes of
IfcPhysicalSimpleQuantity), that all apply to a given component or
aspect of the element.
EXAMPLE: A layered element, like a wall, may
have several material layers, each having individual quantities, like footprint
area, side area and volume. An instance of IfcPhysicalComplexQuantity
would group these individual quantities (given by a subtype of
IfcPhysicalSimpleQuantity) and name them according to the material layer
name by using the Name attribute. The Discrimination attribute
would then be 'layer'.
A section "Quantity Use Definition" at individual entities as subtypes
of IfcBuildingElement gives guidance to the usage of the Name and
Discrimination attribute to characterize the complex quantities.
HISTORY New entity in IFC Release 2x2
Addendum 1.
IFC2x2 ADDENDUM 1 CHANGE The entity
IfcPhysicalComplexQuantity has been added. Upward compatibility for file
based exchange is guaranteed.
EXPRESS specification:
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| ENTITY IfcPhysicalComplexQuantity
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| WR21
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SIZEOF(QUERY(temp <* HasQuantities | SELF :=: temp)) = 0;
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Attribute definitions:
| HasQuantities
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Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination.
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| Discrimination
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Identification of the dicrimination by which this physical complex property is distinguished. Examples
of discriminations are 'layer', 'steel bar diameter', etc.
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| Quality
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Additional indication of a quality of the quantities that are grouped under this physical complex quantity.
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| Usage
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Additional indication of a usage type of the quantities that are grouped under this physical complex
quantity.
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Formal Propositions:
| WR21
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The IfcPhysicalComplexQuantity should not reference itself within the list of HasQuantities.
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Inheritance graph
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| ENTITY IfcPhysicalComplexQuantity;
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