8.18.7.1 IfcRepresentationContextSameWCS

8.18.7.1.1 Semantic definition

If there are several instances of IfcGeometricRepresentationContext within one project file, the XY plane of all WorldCoordinateSystem's shall be coplanar and identical.

8.18.7.1.2 Formal representation

RULE IfcRepresentationContextSameWCS FOR
(IfcGeometricRepresentationContext);
LOCAL
IsDifferent : LOGICAL := FALSE;
END_LOCAL;
IF (SIZEOF(IfcGeometricRepresentationContext) > 1)
THEN
REPEAT i := 2 TO HIINDEX(IfcGeometricRepresentationContext);
IF (IfcGeometricRepresentationContext[1].WorldCoordinateSystem :<>: IfcGeometricRepresentationContext[i].WorldCoordinateSystem)
THEN
IsDifferent := (NOT(IfcSameValidPrecision(IfcGeometricRepresentationContext[1].Precision,
IfcGeometricRepresentationContext[i].Precision)))
OR (NOT(IfcSameAxis2Placement(IfcGeometricRepresentationContext[1].WorldCoordinateSystem,
IfcGeometricRepresentationContext[i].WorldCoordinateSystem,
IfcGeometricRepresentationContext[1].Precision)));
IF (IsDifferent = TRUE) THEN
ESCAPE;
END_IF;
END_IF;
END_REPEAT;
END_IF;
WHERE
WR1 : IsDifferent = FALSE;
END_RULE;