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diff --git a/components/cic_unification/cicMetaSubst.mli b/components/cic_unification/cicMetaSubst.mli
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+(* Copyright (C) 2004, 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/
+ *)
+
+exception MetaSubstFailure of string Lazy.t
+exception Uncertain of string Lazy.t
+exception AssertFailure of string Lazy.t
+exception DeliftingARelWouldCaptureAFreeVariable;;
+
+(* The entry (i,t) in a substitution means that *)
+(* (META i) have been instantiated with t.      *)
+(* type substitution = (int * (Cic.context * Cic.term)) list *)
+
+  (** @raise SubstNotFound *)
+
+(* apply_subst subst t                     *)
+(* applies the substitution [subst] to [t] *)
+(* [subst] must be already unwinded        *)
+
+val apply_subst : Cic.substitution -> Cic.term -> Cic.term 
+val apply_subst_context : Cic.substitution -> Cic.context -> Cic.context 
+val apply_subst_metasenv: Cic.substitution -> Cic.metasenv -> Cic.metasenv 
+
+(*** delifting ***)
+
+val delift : 
+  int -> Cic.substitution -> Cic.context -> Cic.metasenv ->
+  (Cic.term option) list -> Cic.term ->
+    Cic.term * Cic.metasenv * Cic.substitution
+val restrict :
+  Cic.substitution -> (int * int) list -> Cic.metasenv -> 
+  Cic.metasenv * Cic.substitution 
+
+(** delifts the Rels in t of n
+ *  @raise DeliftingARelWouldCaptureAFreeVariable
+ *)
+val delift_rels :
+ Cic.substitution -> Cic.metasenv -> int -> Cic.term ->
+  Cic.term * Cic.substitution * Cic.metasenv
+ 
+(** {2 Pretty printers} *)
+val use_low_level_ppterm_in_context : bool ref
+val set_ppterm_in_context :
+ (metasenv:Cic.metasenv -> Cic.substitution -> Cic.term -> Cic.context ->
+   string) -> unit
+
+val ppsubst_unfolded: metasenv:Cic.metasenv -> Cic.substitution -> string
+val ppsubst: metasenv:Cic.metasenv -> Cic.substitution -> string
+val ppterm: metasenv:Cic.metasenv -> Cic.substitution -> Cic.term -> string
+val ppcontext:
+ metasenv:Cic.metasenv -> ?sep: string -> Cic.substitution -> Cic.context ->
+   string
+val ppterm_in_name_context:
+ metasenv:Cic.metasenv -> Cic.substitution -> Cic.term ->
+  (Cic.name option) list -> string
+val ppterm_in_context:
+ metasenv:Cic.metasenv -> Cic.substitution -> Cic.term -> Cic.context -> string
+val ppmetasenv: ?sep: string -> Cic.substitution -> Cic.metasenv -> string
+
+(** {2 Format-like pretty printers}
+ * As above with prototypes suitable for toplevel/ocamldebug printers. No
+ * subsitutions are applied here since such printers are required to be invoked
+ * with only one argument.
+ *)
+
+val fppsubst: Format.formatter -> Cic.substitution -> unit
+val fppterm: Format.formatter -> Cic.term -> unit
+val fppmetasenv: Format.formatter -> Cic.metasenv -> unit
+
+(*
+(* DEBUG *)
+val print_counters: unit -> unit
+val reset_counters: unit -> unit
+*)
+
+(* val clean_up_meta :
+  Cic.substitution -> Cic.metasenv -> Cic.term -> Cic.term
+*)