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diff --git a/components/library/librarySync.mli b/components/library/librarySync.mli
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+(* Copyright (C) 2004-2005, 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/
+ *)
+
+exception AlreadyDefined of UriManager.uri
+
+val set_object_declaration_hook : (UriManager.uri -> Cic.obj -> unit) -> unit
+
+(* this is a pointer to the function which builds the inversion principle *)
+val build_inversion_principle: (UriManager.uri-> Cic.obj -> (UriManager.uri * Cic.obj) list) ref
+
+(* adds an object to the library together with all auxiliary lemmas on it *)
+(* (e.g. elimination principles, projections, etc.)                       *)
+(* it returns the list of the uris of the auxiliary lemmas generated      *)
+val add_obj: 
+  RefinementTool.kit -> 
+  UriManager.uri -> Cic.obj -> 
+    UriManager.uri list
+
+(* inverse of add_obj;                                                   *)
+(* Warning: it does not remove the dependencies on the object and on its *)
+(* auxiliary lemmas!                                                     *)
+val remove_obj: UriManager.uri -> unit
+
+(* Informs the library that [uri] is a coercion.                         *)
+(* This can generate some composite coercions that, if [add_composites]  *)
+(* is true are added to the library.                                     *)
+(* The list of added objects is returned.                                *)
+val add_coercion: 
+  add_composites:bool -> 
+  RefinementTool.kit -> UriManager.uri -> int (* arity *) ->
+   int (* saturations *) -> string (* baseuri *) ->
+    (UriManager.uri * int * int) list (* URI, arity, saturations *)
+
+(* inverse of add_coercion, removes both the eventually created composite   *)
+(* coercions and the information that [uri] and the composites are coercion *)
+val remove_coercion: UriManager.uri -> unit
+
+(* this is used when resetting, but the more gracefull push/pop can be used to
+ * suspend/resume an execution *)
+val remove_all_coercions: unit -> unit
+val push: unit -> unit
+val pop: unit -> unit