spline ( ';' spline )*
spline = (endp)? (startp)? point (triple)+
triple = point point point
endp = "e,%f,%f"
startp = "s,%f,%f"
If a spline has points p₁ p₂ p₃ ... pₙ, (n = 1 (mod 3)), the points correspond to the control points of a cubic B-spline from p₁ to pₙ. If startp is given, it touches one node of the edge, and the arrowhead goes from p₁ to startp. If startp is not given, p₁ touches a node. Similarly for pₙ and endp.
splineType is a valid type for:
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attr-types/splineType/