S (ocamlgraph.Graph.DGraphTreeModel.S)

module Tree : Graphviz.GraphWithDotAttrs

module TreeManipulation : sig ... end

type cluster = string

type graph_layout

class  tree_model : graph_layout -> TreeManipulation.t -> [ Tree.V.t, Tree.E.t, cluster ]
                                           Graph__DGraphModel.abstract_model

val tree : unit -> TreeManipulation.t