type: string | bool, default: false
If true, constraints are generated for each edge in the largest (heuristic) directed acyclic subgraph such that the edge must point downwards.
Only valid when mode="ipsep".
If hier, generates level constraints similar to those used with mode="hier". The main difference is that, in the latter case, only these constraints are involved, so a faster solver can be used.
Note: neato only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/diredgeconstraints/