#### IfcRepresentationContextSameWCS

##### Semantic definitions at the global rule

Global Rule Definition

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

> NOTE The instances of IfcGeometricRepresentationContext do not define their own world coordinate system, the refer to the world coordinate system of the ParentContext.

> HISTORY New global rule in Release IFC2x

##### Formal representations

EXPRESS Specification

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;

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