#### 8.18.2.3 IfcStateEnum

The IfcStateEnum enumeration identifies the state or accessibility of the object (for example, read/write, locked).

Valid enumerations are:

- READWRITE: Object is in a Read-Write state. It may be modified by an application.
- READONLY: Object is in a Read-Only state. It may be viewed but not modified by an application.
- LOCKED: Object is in a Locked state. It may not be accessed by an application.
- READWRITELOCKED: Object is in a Read-Write-Locked state. It may not be accessed by an application.
- READONLYLOCKED: Object is in a Read-Only-Locked state. It may not be accessed by an application.

> HISTORY New enumeration in IFC2.0.

> IFC2x3 CHANGE This concept was initially introduced in IFC2.0 as IfcModifiedFlag of type BINARY(3) FIXED and has been modified in R2x3 to an enumeration. It was initially introduced as a first step towards providing facilities for partial model exchange and is intended for use primarily by a model server so that an application can identify the state of the object.

XSD Specification:

<xs:simpleType name="IfcStateEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="readwrite"/>
<xs:enumeration value="readonly"/>
<xs:enumeration value="locked"/>
<xs:enumeration value="readwritelocked"/>
<xs:enumeration value="readonlylocked"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcStateEnum = ENUMERATION OF (
| READWRITE, READONLY, LOCKED, READWRITELOCKED, READONLYLOCKED);
END_TYPE;

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