IfcPermeableCoveringOperationEnum

BACnet MVD

#### IfcPermeableCoveringOperationEnum

Natural language names

| Permeable Covering Operation Enum

##### Semantic definitions at the type

Type definition

This enumeration defines the valid types of permeable coverings.

> HISTORY New enumeration in IFC2.0.

Enumeration definition

Constant | Description
--- | ---
GRILL | Protective screen of metal bars or wires.
LOUVER | Set of fixed or movable strips of wood, metal, etc. arranged to let air in while keeping light or rain out.
SCREEN | Upright, fixed or movable, sometimes folding framework used for protection against heat, light, access or similar.
USERDEFINED | User defined permeable covering type.
NOTDEFINED | No information available.

##### Formal representations

XML Specification
`<xs:simpleType name="IfcPermeableCoveringOperationEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="grill"/>
<xs:enumeration value="louver"/>
<xs:enumeration value="screen"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcPermeableCoveringOperationEnum = ENUMERATION OF (
GRILL,
LOUVER,
SCREEN,
USERDEFINED,
NOTDEFINED);
END_TYPE;

EXPRESS-G diagram

`

References: IfcPermeableCoveringProperties

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