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diff --git a/helm/ocaml/library/librarySync.mli b/helm/ocaml/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
+
+(* 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: UriManager.uri -> Cic.obj -> basedir:string -> 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: 
+  basedir:string -> add_composites:bool -> UriManager.uri -> 
+    UriManager.uri list
+
+(* 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
+
+(* mh... *)
+val remove_all_coercions: unit -> unit
+