IfcSurfaceSide

BACnet MVD

#### IfcSurfaceSide

Natural language names

| Surface Side

##### Semantic definitions at the type

Type definition

IfcSurfaceSide is a denotion of whether negative, positive or both sides of a surface are being referenced.

> NOTE Type adapted from surface_side defined in ISO10303-46.

> HISTORY New enumeration type in IFC2.0

Enumeration definition

Constant | Description
--- | ---
POSITIVE | The side of a surface which is in the same direction as the surface normal derived from the mathematical definition.
NEGATIVE | The side of a surface which is in the opposite direction than the surface normal derived from the mathematical definition.
BOTH | Both, positive and negative side.

##### Formal representations

XML Specification
`<xs:simpleType name="IfcSurfaceSide">
<xs:restriction base="xs:string">
<xs:enumeration value="positive"/>
<xs:enumeration value="negative"/>
<xs:enumeration value="both"/>
</xs:restriction>
</xs:simpleType>
`
EXPRESS Specification
`TYPE IfcSurfaceSide = ENUMERATION OF (
POSITIVE,
NEGATIVE,
BOTH);
END_TYPE;

EXPRESS-G diagram

`

References: IfcSurfaceStyle

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