jwg12 IfcIndexedPolyCurve SelfIntersect UML change

[aothms]

Revert change for compatibility with IFC4

[aothms]

--- tmp/a/IFC.exp	2022-08-27 01:47:39.753527400 +0200
+++ tmp/b/IFC.exp	2022-09-05 20:19:42.518332800 +0200
@@ -7372,21 +7372,21 @@
 	MappedTo : IfcTessellatedFaceSet;
 	Opacity : OPTIONAL IfcNormalisedRatioMeasure;
 	Colours : IfcColourRgbList;
 	ColourIndex : LIST [1:?] OF IfcPositiveInteger;
 END_ENTITY;
 
 ENTITY IfcIndexedPolyCurve
  SUBTYPE OF (IfcBoundedCurve);
 	Points : IfcCartesianPointList;
 	Segments : OPTIONAL LIST [1:?] OF IfcSegmentIndexSelect;
-	SelfIntersect : IfcLogical;
+	SelfIntersect : OPTIONAL IfcBoolean;
  WHERE
 	Consecutive : NOT(EXISTS(Segments)) OR IfcConsecutiveSegments(Segments);
 END_ENTITY;
 
 ENTITY IfcIndexedPolygonalFace
  SUPERTYPE OF (ONEOF
 	(IfcIndexedPolygonalFaceWithVoids))
  SUBTYPE OF (IfcTessellatedItem);
 	CoordIndex : LIST [3:?] OF IfcPositiveInteger;
  INVERSE