(*
    ||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_______________________________________________________________ *)

type ('a, 'b) item = Term of 'a * 'b
                   | LEnv of 'a
                   | Warn of string
		   | String of string
		   | Loc

type ('a, 'b) message = ('a, 'b) item list

type ('a, 'b) specs = {
   pp_term: 'a -> Format.formatter -> 'b -> unit;
   pp_lenv: Format.formatter -> 'a -> unit
}

val loc: string ref

val level: int ref

val warn: string -> unit

val box: int -> unit

val unbox: int -> unit

val flush: int -> unit

val box_err: unit -> unit

val flush_err: unit -> unit

val log: ('a, 'b) specs -> int -> ('a, 'b) message -> unit

val error: ('a, 'b) specs -> ('a, 'b) message -> unit

val items1: string -> ('a, 'b) message

val t_items1: string -> 'a -> 'b -> ('a, 'b) message

val et_items1:
   string -> 'a -> string -> 'b -> ('a, 'b) message

val et_items2:
   string -> 'a -> string -> 'b -> 
   ?sc2:string -> ?c2:'a -> string -> 'b -> 
   ('a, 'b) message

val et_items3:
   string -> 'a -> string -> 'b -> 
   ?sc2:string -> ?c2:'a -> string -> 'b -> 
   ?sc3:string -> ?c3:'a -> string -> 'b ->
   ('a, 'b) message