`object
method bounding_box : XDot.bounding_box
method dst : 'a -> 'b
method find_edge : 'b -> 'b -> 'a
method get_cluster_layout : 'c -> XDot.cluster_layout
method get_edge_layout : 'a -> XDot.edge_layout
method get_vertex_layout : 'b -> XDot.node_layout
method iter_associated_vertex : ('b -> unit) -> 'b -> unit
method iter_clusters : ('c -> unit) -> unit
method iter_edges : ('b -> 'b -> unit) -> unit
method iter_edges_e : ('a -> unit) -> unit
method iter_pred : ('b -> unit) -> 'b -> unit
method iter_pred_e : ('a -> unit) -> 'b -> unit
method iter_succ : ('b -> unit) -> 'b -> unit
method iter_succ_e : ('a -> unit) -> 'b -> unit
method iter_vertex : ('b -> unit) -> unit
method mem_edge : 'b -> 'b -> bool
method mem_edge_e : 'a -> bool
method mem_vertex : 'b -> bool
method src : 'a -> 'b
end`