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diff --git a/helm/ocaml/lexicon/lexiconAst.ml b/helm/ocaml/lexicon/lexiconAst.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/
+ *)
+
+(* $Id$ *)
+
+type direction = [ `LeftToRight | `RightToLeft ]
+
+type loc = Token.flocation
+
+type alias_spec =
+  | Ident_alias of string * string        (* identifier, uri *)
+  | Symbol_alias of string * int * string (* name, instance no, description *)
+  | Number_alias of int * string          (* instance no, description *)
+
+(** To be increased each time the command type below changes, used for "safe"
+ * marshalling *)
+let magic = 5
+
+type command =
+  | Include of loc * string
+  | Alias of loc * alias_spec
+      (** parameters, name, type, fields *) 
+  | Notation of loc * direction option * CicNotationPt.term * Gramext.g_assoc *
+      int * CicNotationPt.term
+      (* direction, l1 pattern, associativity, precedence, l2 pattern *)
+  | Interpretation of loc *
+      string * (string * CicNotationPt.argument_pattern list) *
+        CicNotationPt.cic_appl_pattern
+      (* description (i.e. id), symbol, arg pattern, appl pattern *)
+
+(* composed magic: term + command magics. No need to change this value *)
+let magic = magic + 10000 * CicNotationPt.magic
+