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Clarifies when zero-length segments are required in the geometric definition #970

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Clarifies when zero-length segments are required in the geometric definition #970

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2 changes: 1 addition & 1 deletion ...esting/Alignment Layouts/Alignment Layout - Reusing Horizontal Layout/README.md
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Expand Up @@ -8,7 +8,7 @@ In the diagram below is an example of a *parent* alignment, with the horizontal
When defining the list of segments for the business logic (i.e., _IfcAlignmentHorizontalSegment_, _IfcAlignmentVerticalSegment_, _IfcAlignmentCantSegment_):

1. A **zero-length segment** shall be added, at the end of the list of segments for _IfcAlignmentSegment.DesignParameters_.
2. If the geometry definition is also present, then each of the zero-length segments shall have a _IfcCurveSegment_ counterpart - of length zero.
2. If the geometry definition is also present, and it is not IfcOffsetCurveByDistances, IfcPolyline or IfcIndexedPolyCurve, then each of the zero-length segments shall have a _IfcCurveSegment_ counterpart - of length zero.

```
concept {
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