IfcSequenceEnum

BACnet MVD

#### IfcSequenceEnum

Natural language names

| Sequence Enum

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcSequenceEnum |  |  | MOVED | Schema changed from IFCKERNEL to IFCPROCESSEXTENSION.

##### Semantic definitions at the type

Type definition

IfcSequenceEnum is an enumeration that defines the different ways in which a time lag is applied to a sequence between two processes.

> HISTORY New entity in IFC1.0

Enumeration definition

Constant | Description
--- | ---
START_START | The predecessor task must start before the successor task may start.
START_FINISH | The predecessor task must start before the successor task may finish.
FINISH_START | The predecessor task must finish before the successor task may start.
FINISH_FINISH | The predecessor task must finish before the successor task may finish.
USERDEFINED |
NOTDEFINED |

##### Formal representations

XML Specification
`<xs:simpleType name="IfcSequenceEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="start_start"/>
<xs:enumeration value="start_finish"/>
<xs:enumeration value="finish_start"/>
<xs:enumeration value="finish_finish"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcSequenceEnum = ENUMERATION OF (
START_START,
START_FINISH,
FINISH_START,
FINISH_FINISH,
USERDEFINED,
NOTDEFINED);
END_TYPE;

EXPRESS-G diagram

`

References: IfcRelSequence

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