IfcQuantityCount

Natural language names
Semantic definitions at the entity
Entity definition

An physical quantity, IfcQuantityCount, that defines a derived count 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: An radiator may be measured according to its number of coils. The actual counting method depends on the method of measurement used.

HISTORY New entity in IFC Release 2.x . It replaces the calcXxx attributes used in previous IFC Releases

Attribute definitions
#AttributeTypeCardinalityDescription A
4CountValueIfcCountMeasure[1:1] Count measure value of this quantity.X
Formal Propositions
RuleDescription
WR21The value of the count shall be greater than or equal to zero.
Inherited definitions from supertypes
Entity inheritance IfcPhysicalSimpleQuantity IfcPhysicalQuantity
Attribute inheritance
#AttributeTypeCardinalityDescriptionA
IfcPhysicalQuantity
1NameIfcLabel[1:1] Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.X
2Description- This attribute is out of scope for this model view definition and shall not be set.
IfcPhysicalSimpleQuantity
3Unit- This attribute is out of scope for this model view definition and shall not be set.
IfcQuantityCount
4CountValueIfcCountMeasure[1:1] Count measure value of this quantity.X
Formal representations
XSD Specification
 <xs:element name="IfcQuantityCount" type="ifc:IfcQuantityCount" substitutionGroup="ifc:IfcPhysicalSimpleQuantity" nillable="true"/>
 <xs:complexType name="IfcQuantityCount">
  <xs:complexContent>
   <xs:extension base="ifc:IfcPhysicalSimpleQuantity">
    <xs:attribute name="CountValue" type="ifc:IfcCountMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcQuantityCount
 SUBTYPE OF (IfcPhysicalSimpleQuantity);
  CountValue : IfcCountMeasure;
 WHERE
  WR21 : CountValue >= 0.;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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