+(*
+ These are the real functions to add eq/ge/gt constraints
+ to the passed graph, returning an updated graph or raising
+ UniverseInconsistency
+*)
+val add_eq:
+ ?fast:bool -> universe -> universe -> universe_graph -> universe_graph
+val add_ge:
+ ?fast:bool -> universe -> universe -> universe_graph -> universe_graph
+val add_gt:
+ ?fast:bool -> universe -> universe -> universe_graph -> universe_graph
+
+(*
+ debug function to print the graph to standard error
+*)
+val print_ugraph:
+ universe_graph -> unit
+
+(*
+ does what expected, but I don't remember why this was exported
+*)
+val string_of_universe:
+ universe -> string
+
+(*
+ given the list of visible universes (see universes_of_obj) returns a
+ cleaned graph (cleaned from the not visible nodes)
+*)
+val clean_ugraph:
+ universe_graph -> universe list -> universe_graph
+
+(*
+ Since fresh() can't add the right uri to each node, you
+ must fill empty nodes with the uri before you serialize the graph to xml
+*)
+val fill_empty_nodes_with_uri:
+ universe_graph -> UriManager.uri -> universe_graph
+
+(*
+ makes a union.
+ TODO:
+ - remember already merged uri so that we completely skip already merged
+ graphs, this may include a dependecy graph (not merge a subpart of an
+ already merged graph)
+*)
+val merge_ugraphs:
+ universe_graph -> universe_graph -> universe_graph
+
+(*
+ ugraph to xml file and viceversa
+*)
+val write_xml_of_ugraph:
+ string -> universe_graph -> unit
+
+(*
+ given a filename parses the xml and returns the data structure
+*)
+val ugraph_of_xml:
+ string -> universe_graph
+val restart_numbering:
+ unit -> unit
+
+ (** re-hash-cons URIs contained in the given universe so that phisicaly
+ * equality could be enforced. Mainly used by
+ * CicEnvironment.restore_from_channel *)
+val recons_graph: universe_graph -> universe_graph
+
+ (** re-hash-cons a single universe *)
+val recons_univ: universe -> universe
+
+ (** consistency chek that should be done before committin the graph to the
+ * cache *)
+val assert_univs_have_uri: universe_graph -> unit
+
+ (** asserts the univers is named *)
+val assert_univ: universe -> unit
+
+(*
+ Benchmarking stuff
+*)
+val get_spent_time: unit -> float
+val reset_spent_time: unit -> unit