Module type DGraphTreeModel.S

module type S = sig .. end

module Tree: Graph.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]] DGraphModel.abstract_model
val tree : unit -> TreeManipulation.t