(*
    ||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
                   | Context of 'a
                   | Warn of string
		   | String of string

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

val level: int ref

val warn: string -> unit

val box: unit -> unit

val unbox: unit -> unit

val flush: unit -> unit

val box_err: unit -> unit

val flush_err: unit -> unit

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

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

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

val ct_items1: string -> 'a -> 'b -> ('a, 'b) item list

val ct_items2: string -> 'a -> 'b -> string -> 'a -> 'b -> ('a, 'b) item list