#### 8.12.2.4 IfcQuantityTime

| Quantité de durée
| Mengenangabe - Zeit

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.

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcQuantityTime

| SUBTYPE OF IfcStrippedOptional;

TimeValue | : | IfcTimeMeasure;
Formula | : | OPTIONAL IfcLabel;

| WHERE

WR21 | : | NOT(EXISTS(SELF\IfcPhysicalSimpleQuantity.Unit)) OR (SELF\IfcPhysicalSimpleQuantity.Unit.UnitType = IfcUnitEnum.TIMEUNIT);
WR22 | : | TimeValue >= 0.;

END_ENTITY;

EXPRESS-G diagram

Attribute Definitions:

TimeValue | : | Time 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 | : | If a unit is given, the unit type shall be time unit.
WR22 | : | A valid weight quantity shall be greater than or equal to zero.

Inheritance Graph:

ENTITY IfcQuantityTime

| ENTITY IfcStrippedOptional

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

| INVERSE

| ENTITY IfcStrippedOptional

Unit | : | OPTIONAL IfcNamedUnit;

| ENTITY IfcQuantityTime

TimeValue | : | IfcTimeMeasure;
Formula | : | OPTIONAL IfcLabel;

END_ENTITY;

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