(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.      
     \ /   This software is distributed as is, NO WARRANTY.     
      V_______________________________________________________________ *)

(* $Id$ *)

exception LibraryOutOfSync of string Lazy.t

type timestamp

class status :
 object ('self)
  method timestamp: timestamp
  method set_timestamp: timestamp -> 'self
  method set_library_status: <timestamp: timestamp; ..> -> 'self
 end

(* it also checks it and add it to the environment *)
val add_obj: #status as 'status -> NCic.obj -> 'status
val aliases_of: NUri.uri -> NReference.reference list
val resolve: string -> NReference.reference list
(* warning: get_obj may raise (NCicEnvironment.ObjectNotFoud l) *)
val get_obj: NUri.uri -> NCic.obj (* changes the current timestamp *)

val clear_cache : unit -> unit

val time_travel: #status -> unit
val decompile: baseuri:NUri.uri -> unit

module type Serializer =
 sig
  type status
  type obj
  val register:
   string ->
    ('a -> refresh_uri_in_term:(NCic.term -> NCic.term) -> status -> status) ->
    ('a -> obj)
  val serialize: baseuri:NUri.uri -> obj list -> unit
  val require: baseuri:NUri.uri -> status -> status
 end

module Serializer(S: sig type status end): Serializer with type status= S.status

val init: unit -> unit

(* EOF *)