Splits an edge's title into the two nodes it joins.
A quoted name may hold -> or -- itself, so every place the operator appears is tried, and the first split whose sides both name a node is taken.
->
--
The edge's title, e.g. a->b or a:out--b
a->b
a:out--b
Every node's name
The ends and whether the edge is directed, or null when no split names two nodes
Splits an edge's title into the two nodes it joins.
A quoted name may hold
->or--itself, so every place the operator appears is tried, and the first split whose sides both name a node is taken.