control point

Determining Bezier splines that are part of a concentrated edge in attributed dot

My attributed dot files are generated with concentrate=true so each Bezier spline is only listed in one edge, even though it might be logically part of many edges.

Is there any way to determine from an attributed dot file which Bezier splines belong to a certain edge?

B-spline control point format

Does Graphviz use quadratic or cubic B-splines for edges, or both?  When reading control points from the plain output format, can one assume:
1.  The first and last points are touched by the B-spline
2.  There are always at least 3+2k (quadratic) or 4+3k (cubic) control points?

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