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diff --git a/helm/ocaml/lexicon/lexiconAstPp.ml b/helm/ocaml/lexicon/lexiconAstPp.ml
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+(* Copyright (C) 2005, 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://helm.cs.unibo.it/
+ *)
+
+(* $Id$ *)
+
+open Printf
+
+open LexiconAst
+
+let pp_l1_pattern = CicNotationPp.pp_term
+let pp_l2_pattern = CicNotationPp.pp_term
+
+let pp_alias = function
+  | Ident_alias (id, uri) -> sprintf "alias id \"%s\" = \"%s\"" id uri
+  | Symbol_alias (symb, instance, desc) ->
+      sprintf "alias symbol \"%s\" (instance %d) = \"%s\""
+        symb instance desc
+  | Number_alias (instance,desc) ->
+      sprintf "alias num (instance %d) = \"%s\"" instance desc
+  
+let pp_associativity = function
+  | Gramext.LeftA -> "left associative"
+  | Gramext.RightA -> "right associative"
+  | Gramext.NonA -> "non associative"
+
+let pp_precedence i = sprintf "with precedence %d" i
+
+let pp_argument_pattern = function
+  | CicNotationPt.IdentArg (eta_depth, name) ->
+      let eta_buf = Buffer.create 5 in
+      for i = 1 to eta_depth do
+        Buffer.add_string eta_buf "\\eta."
+      done;
+      sprintf "%s%s" (Buffer.contents eta_buf) name
+
+let pp_interpretation dsc symbol arg_patterns cic_appl_pattern = 
+  sprintf "interpretation \"%s\" '%s %s = %s"
+    dsc symbol
+    (String.concat " " (List.map pp_argument_pattern arg_patterns))
+    (CicNotationPp.pp_cic_appl_pattern cic_appl_pattern)
+ 
+let pp_dir_opt = function
+  | None -> ""
+  | Some `LeftToRight -> "> "
+  | Some `RightToLeft -> "< "
+
+let pp_notation dir_opt l1_pattern assoc prec l2_pattern = 
+  sprintf "notation %s\"%s\" %s %s for %s"
+    (pp_dir_opt dir_opt)
+    (pp_l1_pattern l1_pattern)
+    (pp_associativity assoc)
+    (pp_precedence prec)
+    (pp_l2_pattern l2_pattern)
+    
+let pp_command = function
+  | Include (_,path) -> "include " ^ path
+  | Alias (_,s) -> pp_alias s
+  | Interpretation (_, dsc, (symbol, arg_patterns), cic_appl_pattern) ->
+      pp_interpretation dsc symbol arg_patterns cic_appl_pattern
+  | Notation (_, dir_opt, l1_pattern, assoc, prec, l2_pattern) ->
+      pp_notation dir_opt l1_pattern assoc prec l2_pattern
+