Update README.md

[TinaTyf]

Correction of business logic

[TinaTyf]

According to the semantic definition of IfcSegmentedReferenceCurve and the example Linear Placement Of Signal, the correct logic could be : IfcCompositeCurve ( Horizontal Segments ) → IfcGradientCurve ( Vertical Segments ) .BaseCurve ( Horizontal Segments ) → IfcSegmentedReferenceCurve ( Cant Segments ).BaseCurve ( Horizontal + Vertical Segments )

[aothms]

IfcSegmentedReferenceCurve:Segments -> IfcCurveSegment_1 -> Curve_Segment_Vertical

You're right. Pairing Vertical with IfcSegmentedReferenceCurve is definitely a mistake.

[berlotti]

Is this something we can change? Or is it something that needs to be fixed in an update of 4.3?
We cannot just make changes in a published standard.... even though they are clear mistakes.

[aothms]

That's a matter of interpretation, especially for the templates. One person considers them just documentation, the next person considers them something formal. I've never seen the compatibility document that was drafted together with ISO, but I guess the answer is there.

At this point it's probably easier to just park it for the official update.