#### 8.12.2.2 IfcQuantityCount

| Quantité de comptage
| Mengenangabe - Zählung

IfcQuantityCount is a physical quantity 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 IFC2x. It replaces the calcXxx attributes used in previous IFC Releases.

XSD Specification:

<xs:element name="IfcQuantityCount" type="ifc:IfcQuantityCount" substitutionGroup="ifc:IfcStrippedOptional" nillable="true"/>
<xs:complexType name="IfcQuantityCount">
<xs:complexContent>
<xs:extension base="ifc:IfcStrippedOptional"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcQuantityCount

| SUBTYPE OF IfcStrippedOptional;

CountValue | : | IfcCountMeasure;
Formula | : | OPTIONAL IfcLabel;

| WHERE

WR21 | : | CountValue >= 0.;

END_ENTITY;

EXPRESS-G diagram

Attribute Definitions:

CountValue | : | Count measure value of this quantity.
Formula | : | 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.

Formal Propositions:

WR21 | : | The value of the count shall be greater than or equal to zero.

Inheritance Graph:

ENTITY IfcQuantityCount

| ENTITY IfcStrippedOptional

Name | : | IfcLabel;
Description | : | OPTIONAL IfcText;

| INVERSE

| ENTITY IfcStrippedOptional

Unit | : | OPTIONAL IfcNamedUnit;

| ENTITY IfcQuantityCount

CountValue | : | IfcCountMeasure;
Formula | : | OPTIONAL IfcLabel;

END_ENTITY;

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