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diff --git a/helm/ocaml/tactics/statefulProofEngine.mli b/helm/ocaml/tactics/statefulProofEngine.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/
- *)
-
-(** Stateful handling of proof status *)
-
-exception No_goal_left
-exception Uri_redefinition
-
-  (** can't undo/redo one or more actions *)
-exception History_failure
-
-type event = [ `Proof_changed | `Proof_completed ]
-
-  (** Proof observer. First callback argument is Some extended_status
-  * when a 'real 'change of the proof happened and None when Proof_changed event
-  * was triggered by a time travel by the means of undo/redo actions. Embedded
-  * status is the status _before_ the current change. Second status is the
-  * status reached _after_ the current change. *)
-type 'a observer =
-  (ProofEngineTypes.status * 'a) option -> (ProofEngineTypes.status * 'a) ->
-    unit
-
-  (** needed to detach previously attached observers *)
-type observer_id
-
-  (** tactic application failed. @see apply_tactic *)
-exception Tactic_failure of exn
-
-  (** one or more observers failed. @see apply_tactic *)
-exception Observer_failures of (observer_id * exn) list
-
-  (** failure while updating internal data (: 'a). @see apply_tactic *)
-exception Data_failure of exn
-
-(** {2 OO interface} *)
-
-class ['a] status:
-  ?uri:UriManager.uri ->
-  typ:Cic.term -> ?body:Cic.term -> ?metasenv:Cic.metasenv ->
-  (ProofEngineTypes.proof * ProofEngineTypes.goal option -> 'a) ->
-  (ProofEngineTypes.status * 'a -> ProofEngineTypes.status -> 'a) ->
-  unit ->
-  object
-
-    method proof: ProofEngineTypes.proof
-    method metasenv: Cic.metasenv
-    method body: Cic.term
-    method typ: Cic.term
-
-    (** goal -> conjecture
-    * @raise CicUtil.Meta_not_found *)
-    method conjecture: int -> Cic.conjecture
-
-    method proof_completed: bool
-    method goal: int              (** @raise No_goal_left *)
-    method set_goal: int -> unit  (** @raise No_goal_left *)
-
-    method uri: UriManager.uri option
-    method set_uri: UriManager.uri -> unit  (** @raise Uri_redefinition *)
-
-    (** @raise Tactic_failure
-    * @raise Observer_failures
-    * @raise Data_failure
-    *
-    * In case of tactic failure, internal status is left unchanged.
-    * In case of observer failures internal status will be changed and is
-    * granted that all observer will be invoked collecting their failures.
-    * In case of data failure, internal status is left unchanged (rolling back
-    * last tactic application if needed)
-    *)
-    method apply_tactic: ProofEngineTypes.tactic -> unit
-
-    method undo: ?steps:int -> unit -> unit
-    method redo: ?steps:int -> unit -> unit
-
-    method attach_observer:
-      ?interested_in:(event list) -> 'a observer -> observer_id
-
-    method detach_observer: observer_id -> unit
-
-  end
-
-val trivial_status:
-  ?uri:UriManager.uri ->
-  typ:Cic.term -> ?body:Cic.term -> ?metasenv:Cic.metasenv ->
-  unit ->
-    unit status
-