IfcSurfaceSide

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