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diff --git a/helm/ocaml/library/librarySync.ml b/helm/ocaml/library/librarySync.ml
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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/
+ *)
+
+(* $Id$ *)
+
+exception AlreadyDefined of UriManager.uri
+
+let auxiliary_lemmas_hashtbl = UriManager.UriHashtbl.create 29
+
+(* uri |-->  (derived_coercions_in_the_coercion_DB, derived_coercions_in_lib)
+ * 
+ * in case of remove_coercion uri, the first component is removed from the
+ * coercion DB, while the second is passed to remove_obj (and is not [] only if
+ * add_coercion is called with add_composites 
+ * *)
+let coercion_hashtbl = UriManager.UriHashtbl.create 3
+
+let merge_coercions obj =
+  let module C = Cic in
+  let rec aux2 = (fun (u,t) -> u,aux t)
+  and aux = function
+    | C.Rel _ | C.Sort _ as t -> t
+    | C.Meta _ | C.Implicit _ -> assert false
+    | C.Cast (te,ty) -> C.Cast (aux te, aux ty)
+    | C.Prod (name,so,dest) -> 
+        C.Prod (name, aux so, aux dest) 
+    | C.Lambda (name,so,dest) -> 
+        C.Lambda (name, aux so, aux dest)
+    | C.LetIn (name,so,dest) -> 
+        C.LetIn (name, aux so, aux dest)
+    | (Cic.Appl [ c1 ; (Cic.Appl [c2; head]) ]) as t when 
+      CoercGraph.is_a_coercion c1 && CoercGraph.is_a_coercion c2 ->
+        let source_carr = CoercGraph.source_of c2 in
+        let tgt_carr = CoercGraph.target_of c1 in
+        (match CoercGraph.look_for_coercion source_carr tgt_carr 
+        with
+        | CoercGraph.SomeCoercion c -> Cic.Appl [ c ; head ]
+        | _ -> assert false) (* the composite coercion must exist *)
+    | C.Appl l -> C.Appl (List.map aux l)
+    | C.Var (uri,exp_named_subst) -> 
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.Var (uri, exp_named_subst)
+    | C.Const (uri,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.Const (uri, exp_named_subst)
+    | C.MutInd (uri,tyno,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.MutInd (uri,tyno,exp_named_subst)
+    | C.MutConstruct (uri,tyno,consno,exp_named_subst) ->
+        let exp_named_subst = List.map aux2 exp_named_subst in
+        C.MutConstruct (uri,tyno,consno,exp_named_subst)  
+    | C.MutCase (uri,tyno,out,te,pl) ->
+        let pl = List.map aux pl in
+        C.MutCase (uri,tyno,aux out,aux te,pl)
+    | C.Fix (fno, fl) ->
+        let fl = List.map (fun (name,idx,ty,bo)->(name,idx,aux ty,aux bo)) fl in
+        C.Fix (fno, fl)
+    | C.CoFix (fno, fl) ->
+        let fl = List.map (fun (name,ty,bo) -> (name, aux ty, aux bo)) fl in
+        C.CoFix (fno, fl)
+  in
+  match obj with
+  | C.Constant (id, body, ty, params, attrs) -> 
+      let body = 
+        match body with 
+        | None -> None 
+        | Some body -> Some (aux body) 
+      in
+      let ty = aux ty in
+        C.Constant (id, body, ty, params, attrs)
+  | C.Variable (name, body, ty, params, attrs) ->
+      let body = 
+        match body with 
+        | None -> None 
+        | Some body -> Some (aux body) 
+      in
+      let ty = aux ty in
+        C.Variable (name, body, ty, params, attrs)
+  | C.CurrentProof (_name, _conjectures, _body, _ty, _params, _attrs) ->
+      assert false
+  | C.InductiveDefinition (indtys, params, leftno, attrs) ->
+      let indtys = 
+        List.map 
+          (fun (name, ind, arity, cl) -> 
+            let arity = aux arity in
+            let cl = List.map (fun (name, ty) -> (name,aux ty)) cl in
+            (name, ind, arity, cl))
+          indtys
+      in
+        C.InductiveDefinition (indtys, params, leftno, attrs)
+
+let uris_of_obj uri =
+ let innertypesuri = UriManager.innertypesuri_of_uri uri in
+ let bodyuri = UriManager.bodyuri_of_uri uri in
+ let univgraphuri = UriManager.univgraphuri_of_uri uri in
+  innertypesuri,bodyuri,univgraphuri
+
+let paths_and_uris_of_obj uri ~basedir =
+  let basedir = basedir ^ "/xml" in
+  let innertypesuri, bodyuri, univgraphuri = uris_of_obj uri in
+  let innertypesfilename = Str.replace_first (Str.regexp "^cic:") ""
+        (UriManager.string_of_uri innertypesuri) ^ ".xml.gz" in
+  let innertypespath = basedir ^ "/" ^ innertypesfilename in
+  let xmlfilename = Str.replace_first (Str.regexp "^cic:/") ""
+        (UriManager.string_of_uri uri) ^ ".xml.gz" in
+  let xmlpath = basedir ^ "/" ^ xmlfilename in
+  let xmlbodyfilename = Str.replace_first (Str.regexp "^cic:/") ""
+        (UriManager.string_of_uri uri) ^ ".body.xml.gz" in
+  let xmlbodypath = basedir ^ "/" ^  xmlbodyfilename in
+  let xmlunivgraphfilename = Str.replace_first (Str.regexp "^cic:/") ""
+        (UriManager.string_of_uri univgraphuri) ^ ".xml.gz" in
+  let xmlunivgraphpath = basedir ^ "/" ^ xmlunivgraphfilename in
+  xmlpath, xmlbodypath, innertypespath, bodyuri, innertypesuri, 
+  xmlunivgraphpath, univgraphuri
+
+let save_object_to_disk ~basedir uri obj ugraph univlist =
+  let ensure_path_exists path =
+    let dir = Filename.dirname path in
+    HExtlib.mkdir dir
+  in
+  (* generate annobj, ids_to_inner_sorts and ids_to_inner_types *)
+  let annobj = Cic2acic.plain_acic_object_of_cic_object obj in 
+  (* prepare XML *)
+  let xml, bodyxml =
+   Cic2Xml.print_object
+    uri ?ids_to_inner_sorts:None ~ask_dtd_to_the_getter:false annobj 
+  in
+  let xmlpath, xmlbodypath, innertypespath, bodyuri, innertypesuri, 
+      xmlunivgraphpath, univgraphuri = 
+    paths_and_uris_of_obj uri basedir 
+  in
+  List.iter HExtlib.mkdir (List.map Filename.dirname [xmlpath]);
+  (* now write to disk *)
+  ensure_path_exists xmlpath;
+  Xml.pp ~gzip:true xml (Some xmlpath);
+  CicUniv.write_xml_of_ugraph xmlunivgraphpath ugraph univlist;
+  (* we return a list of uri,path we registered/created *)
+  (uri,xmlpath) ::
+  (univgraphuri,xmlunivgraphpath) ::
+    (* now the optional body, both write and register *)
+    (match bodyxml,bodyuri with
+       None,None -> []
+     | Some bodyxml,Some bodyuri->
+         ensure_path_exists xmlbodypath;
+         Xml.pp ~gzip:true bodyxml (Some xmlbodypath);
+         [bodyuri, xmlbodypath]
+     | _-> assert false) 
+
+
+let typecheck_obj =
+ let profiler = HExtlib.profile "add_obj.typecheck_obj" in
+  fun uri obj -> profiler.HExtlib.profile (CicTypeChecker.typecheck_obj uri) obj
+
+let index_obj =
+ let profiler = HExtlib.profile "add_obj.index_obj" in
+  fun ~dbd ~uri ->
+   profiler.HExtlib.profile (fun uri -> MetadataDb.index_obj ~dbd ~uri) uri
+
+let add_single_obj uri obj ~basedir =
+  let obj = 
+    if List.mem `Generated (CicUtil.attributes_of_obj obj) &&
+       not (CoercGraph.is_a_coercion (Cic.Const (uri, [])))
+    then
+      merge_coercions obj 
+    else
+      obj 
+  in
+  let dbd = LibraryDb.instance () in
+  if CicEnvironment.in_library uri then
+    raise (AlreadyDefined uri)
+  else begin
+    typecheck_obj uri obj; (* 1 *)
+    let _, ugraph, univlist = 
+      CicEnvironment.get_cooked_obj_with_univlist CicUniv.empty_ugraph uri in
+    try 
+      index_obj ~dbd ~uri; (* 2 must be in the env *)
+      try
+        (*3*)
+        let new_stuff = save_object_to_disk ~basedir uri obj ugraph univlist in
+        try 
+         HLog.message
+          (Printf.sprintf "%s defined" (UriManager.string_of_uri uri))
+        with exc ->
+          List.iter HExtlib.safe_remove (List.map snd new_stuff); (* -3 *)
+          raise exc
+      with exc ->
+        ignore(LibraryDb.remove_uri uri); (* -2 *)
+        raise exc
+    with exc ->
+      CicEnvironment.remove_obj uri; (* -1 *)
+    raise exc
+  end
+
+let remove_single_obj uri =
+  let derived_uris_of_uri uri =
+   let innertypesuri, bodyuri, univgraphuri = uris_of_obj uri in
+    innertypesuri::univgraphuri::(match bodyuri with None -> [] | Some u -> [u])
+  in
+  let to_remove =
+    uri :: 
+    (if UriManager.uri_is_ind uri then LibraryDb.xpointers_of_ind uri else []) @
+    derived_uris_of_uri uri
+  in   
+  List.iter 
+    (fun uri -> 
+      (try
+        let file = Http_getter.resolve' uri in
+         HExtlib.safe_remove file;
+         HExtlib.rmdir_descend (Filename.dirname file)
+      with Http_getter_types.Key_not_found _ -> ());
+      ignore (LibraryDb.remove_uri uri);
+      (*CoercGraph.remove_coercion uri;*)
+      CicEnvironment.remove_obj uri)
+  to_remove
+
+(*** GENERATION OF AUXILIARY LEMMAS ***)
+
+let generate_elimination_principles ~basedir uri =
+  let uris = ref [] in
+  let elim sort =
+    try
+      let uri,obj = CicElim.elim_of ~sort uri 0 in
+       add_single_obj uri obj ~basedir;
+       uris := uri :: !uris
+    with CicElim.Can_t_eliminate -> ()
+  in
+  try
+    List.iter elim [ Cic.Prop; Cic.Set; (Cic.Type (CicUniv.fresh ())) ];
+    !uris
+  with exn ->
+   List.iter remove_single_obj !uris;
+   raise exn
+
+(* COERCIONS ***********************************************************)
+  
+let remove_all_coercions () =
+  UriManager.UriHashtbl.clear coercion_hashtbl;
+  CoercDb.remove_coercion (fun (_,_,u1) -> true)
+
+let add_coercion ~basedir ~add_composites uri =
+  let coer_ty,_ =
+    let coer = CicUtil.term_of_uri uri in
+    CicTypeChecker.type_of_aux' [] [] coer CicUniv.empty_ugraph 
+  in
+  (* we have to get the source and the tgt type uri
+   * in Coq syntax we have already their names, but
+   * since we don't support Funclass and similar I think
+   * all the coercion should be of the form
+   * (A:?)(B:?)T1->T2
+   * So we should be able to extract them from the coercion type
+   * 
+   * Currently only (_:T1)T2 is supported.
+   * should we saturate it with metas in case we insert it?
+   * 
+   *)
+  let extract_last_two_p ty =
+    let rec aux = function
+      | Cic.Prod( _, src, Cic.Prod (n,t1,t2)) -> 
+          assert false
+          (* not implemented: aux (Cic.Prod(n,t1,t2)) *)
+      | Cic.Prod( _, src, tgt) -> src, tgt
+      | _ -> assert false
+    in
+    aux ty
+  in
+  let ty_src, ty_tgt = extract_last_two_p coer_ty in
+  let src_uri = CoercDb.coerc_carr_of_term (CicReduction.whd [] ty_src) in
+  let tgt_uri = CoercDb.coerc_carr_of_term (CicReduction.whd [] ty_tgt) in
+  let new_coercions = CicCoercion.close_coercion_graph src_uri tgt_uri uri in
+  let composite_uris = List.map (fun (_,_,uri,_) -> uri) new_coercions in
+  (* update the DB *)
+  List.iter 
+    (fun (src,tgt,uri,_) -> CoercDb.add_coercion (src,tgt,uri)) 
+      new_coercions;
+  CoercDb.add_coercion (src_uri, tgt_uri, uri);
+  (* add the composites obj and they eventual lemmas *)
+  let lemmas = 
+    if add_composites then
+      List.fold_left
+        (fun acc (_,_,uri,obj) -> 
+          add_single_obj ~basedir uri obj;
+          uri::acc) 
+        composite_uris new_coercions
+    else
+      []
+  in
+  (* store that composite_uris are related to uri. the first component is the
+   * stuff in the DB while the second is stuff for remove_obj *)
+  UriManager.UriHashtbl.add coercion_hashtbl uri 
+    (composite_uris,if add_composites then composite_uris else []);
+  lemmas
+
+let remove_coercion uri =
+  try
+    let (composites_in_db, composites_in_lib) = 
+      UriManager.UriHashtbl.find coercion_hashtbl uri 
+    in
+    UriManager.UriHashtbl.remove coercion_hashtbl uri;
+    CoercDb.remove_coercion (fun (_,_,u) -> UriManager.eq uri u);
+    (* remove from the DB *) 
+    List.iter 
+      (fun u -> CoercDb.remove_coercion (fun (_,_,u1) -> UriManager.eq u u1))
+      composites_in_db;
+    (* remove composites from the lib *)
+    List.iter remove_single_obj composites_in_lib
+  with
+    Not_found -> () (* mhh..... *)
+    
+
+let generate_projections ~basedir uri fields =
+ let uris = ref [] in
+ let projections = CicRecord.projections_of uri (List.map fst fields) in
+  try
+   List.iter2 
+    (fun (uri, name, bo) (_name, coercion) ->
+      try
+       let ty, ugraph =
+         CicTypeChecker.type_of_aux' [] [] bo CicUniv.empty_ugraph in
+       let attrs = [`Class `Projection; `Generated] in
+       let obj = Cic.Constant (name,Some bo,ty,[],attrs) in
+       
+        add_single_obj ~basedir uri obj;
+        let composites = 
+         if coercion then
+            add_coercion ~basedir ~add_composites:true uri
+          else  
+            []
+        in
+        uris := uri :: composites @ !uris
+      with
+         CicTypeChecker.TypeCheckerFailure s ->
+          HLog.message
+           ("Unable to create projection " ^ name ^ " cause: " ^ Lazy.force s);
+       | CicEnvironment.Object_not_found uri ->
+          let depend = UriManager.name_of_uri uri in
+           HLog.message
+            ("Unable to create projection " ^ name ^ " because it requires " ^
+               depend)
+    ) projections fields;
+   !uris
+  with exn ->
+   List.iter remove_single_obj !uris;
+   raise exn
+
+
+let add_obj uri obj ~basedir =
+ add_single_obj uri obj ~basedir;
+ let uris = ref [] in
+ try
+  begin
+   match obj with
+    | Cic.Constant _ -> ()
+    | Cic.InductiveDefinition (_,_,_,attrs) ->
+        uris := !uris @ generate_elimination_principles ~basedir uri;
+        let rec get_record_attrs =
+          function
+          | [] -> None
+          | (`Class (`Record fields))::_ -> Some fields
+          | _::tl -> get_record_attrs tl
+        in
+         (match get_record_attrs attrs with
+         | None -> () (* not a record *)
+         | Some fields ->
+            uris := !uris @ (generate_projections ~basedir uri fields))
+    | Cic.CurrentProof _
+    | Cic.Variable _ -> assert false
+  end;
+  UriManager.UriHashtbl.add auxiliary_lemmas_hashtbl uri !uris;
+  !uris
+ with exn ->
+  List.iter remove_single_obj !uris;
+  raise exn
+
+let remove_obj uri =
+ let uris =
+  try
+   let res = UriManager.UriHashtbl.find auxiliary_lemmas_hashtbl uri in
+    UriManager.UriHashtbl.remove auxiliary_lemmas_hashtbl uri;
+    res
+  with
+    Not_found -> [] (*assert false*)
+ in
+  List.iter remove_single_obj (uri::uris)
+