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IfcSurfaceSideEnum

Definition from IAI: Denotion of whether negative, positive or both sides of a surface are being referred to.

ENUMERATION
Positive
Negative
Both

HISTORY New Enumeration in IFC2x
ISSUE See issue and change log for changes made in IFC 2x.

EXPRESS specification:

TYPE IfcSurfaceSideEnum = ENUMERATION OF
( POSITIVE,
NEGATIVE,
BOTH);
END_TYPE;

References (1):

Name Type Referred through Express-G
IfcSurfaceStyleUsage Entity
Attribute 'Side'
Diagram 1