IfcTaskDurationEnum

BACnet MVD

#### IfcTaskDurationEnum

Natural language names

| Task Duration Enum
| Enumération des types de durée de tâche

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcTaskDurationEnum |  |  | ADDED |

##### Semantic definitions at the type

Type definition

IfcTaskDurationEnum identifies how a time duration is measured.

> HISTORY New enumeration in IFC4.

Enumeration definition

Constant | Description
--- | ---
ELAPSEDTIME | The time duration is based on elapsed time (24 hours per day, independent of calendar).
WORKTIME | The time duration is based on work time (calendar-dependent).
NOTDEFINED | The time duration is undefined.

##### Formal representations

XML Specification
`<xs:simpleType name="IfcTaskDurationEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="elapsedtime"/>
<xs:enumeration value="worktime"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcTaskDurationEnum = ENUMERATION OF (
ELAPSEDTIME,
WORKTIME,
NOTDEFINED);
END_TYPE;

EXPRESS-G diagram

`

References: IfcLagTime IfcTaskTime

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