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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+module type S = sig
+
+  (* A cluster is just a set of nodes.  This set holds some data.
+     Stm uses this to group nodes contribution to the same proofs and
+     that can be evaluated asynchronously *)
+  module Cluster :
+  sig
+    type 'd t
+    val equal : 'd t -> 'd t -> bool
+    val compare : 'd t -> 'd t -> int
+    val to_string : 'd t -> string
+    val data : 'd t -> 'd
+  end
+
+  type node
+  module NodeSet : Set.S with type elt = node
+
+  type ('edge,'info,'cdata) t
+  
+  val empty : ('e,'i,'d) t
+
+  val add_edge : ('e,'i,'d) t -> node -> 'e -> node -> ('e,'i,'d) t
+  val from_node : ('e,'i,'d) t -> node -> (node * 'e) list
+  val mem : ('e,'i,'d) t -> node -> bool
+  val del_edge : ('e,'i,'d) t -> node -> node -> ('e,'i,'d) t
+  val del_nodes : ('e,'i,'d) t -> NodeSet.t  -> ('e,'i,'d) t
+  val all_nodes : ('e,'i,'d) t -> NodeSet.t
+
+  val iter : ('e,'i,'d) t -> 
+    (node -> 'd Cluster.t option -> 'i option ->
+      (node * 'e) list -> unit) -> unit
+
+  val create_cluster : ('e,'i,'d) t -> node list -> 'd -> ('e,'i,'d) t
+  val cluster_of : ('e,'i,'d) t -> node -> 'd Cluster.t option
+  val del_cluster : ('e,'i,'d) t -> 'd Cluster.t -> ('e,'i,'d) t
+
+  val get_info : ('e,'i,'d) t -> node -> 'i option
+  val set_info : ('e,'i,'d) t -> node -> 'i -> ('e,'i,'d) t
+  val clear_info : ('e,'i,'d) t -> node -> ('e,'i,'d) t
+
+end
+
+module Make(OT : Map.OrderedType) : S with type node = OT.t
+