(* Copyright (C) 2000, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

(*************************************************************************)
(*                                                                       *)
(*                           PROJECT HELM                                *)
(*                                                                       *)
(*                Andrea Asperti <asperti@cs.unibo.it>                   *)
(*                             13/2/2004                                 *)
(*                                                                       *)
(*************************************************************************)

type 
  'expr box =
    Text of attr * string
  | Space of attr
  | H of attr * ('expr box) list
  | V of attr * ('expr box) list
  | Object of attr * 'expr
  | Action of attr * ('expr box) list

and attr = (string option * string * string) list

let smallskip = Text([]," ");;
let skip = Text([],"  ");;

let indent t = H([],[skip;t]);;