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diff --git a/helm/ocaml/library/coercDb.mli b/helm/ocaml/library/coercDb.mli
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+(* Copyright (C) 2000, 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://cs.unibo.it/helm/.
+ *)
+
+
+ (** THIS MODULE SHOULD BE USED ONLY BY CoercGraph/CicCoercion/librarySync
+  * 
+  *   and may be merged with CicCoercion...
+  *  
+  * **)
+
+
+  (** XXX WARNING: non-reentrant *)
+type coerc_carr = Uri of UriManager.uri | Sort of Cic.sort | Term of Cic.term
+exception EqCarrNotImplemented of string Lazy.t
+exception EqCarrOnNonMetaClosed
+val eq_carr: coerc_carr -> coerc_carr -> bool
+val coerc_carr_of_term: Cic.term -> coerc_carr
+val name_of_carr: coerc_carr -> string
+
+val to_list:
+  unit -> 
+    (coerc_carr * coerc_carr * UriManager.uri) list
+
+val add_coercion:
+  coerc_carr * coerc_carr * UriManager.uri -> unit
+
+val remove_coercion:
+  (coerc_carr * coerc_carr * UriManager.uri -> bool) -> unit
+
+val find_coercion: 
+  (coerc_carr * coerc_carr -> bool) -> UriManager.uri list 
+    
+val is_a_coercion: UriManager.uri -> bool
+val get_carr: UriManager.uri -> coerc_carr * coerc_carr
+
+val term_of_carr: coerc_carr -> Cic.term