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diff --git a/helm/ocaml/mathql_interpreter/property.ml b/helm/ocaml/mathql_interpreter/property.ml
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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/.
+ *)
+
+(*
+ *
+ *)
+
+open Dbconn;;
+open Utility;;
+open Intersect;;
+
+
+let getpid p =
+  if (p = "refObj") then "F"
+  else "B"
+;;
+
+(*
+ * implementazione delle funzioni dublin core
+ *)
+let rec property_ex rop path inv = function
+    [] -> []
+  | s::tl -> let mprop = fst path in
+             print_endline mprop;
+             let prop = List.hd (snd path) in
+             match mprop with
+	       
+	       "refObj" (* in base al valore di prop restituisco i valori del relativo campo della tabella relativa all'uri rappresentata da s *)
+	     | "backPointer" ->
+	       print_endline mprop;
+	       let mpid = getpid mprop in
+	       let res =
+	       let c = pgc () in
+	       let tv = pgresult_to_string (c#exec ("select id from registry where uri='" ^ s ^ "'")) in
+	       let q = "select t" ^ tv ^ "." ^ prop ^  "  from t" ^ tv ^ " where prop_id= '" ^ mpid ^ "'" in
+                print_endline q;
+		pgresult_to_string_list (c#exec q)
+	       in
+	         append (res,(property_ex rop path inv tl))
+	       
+                          (*Rimane da capire cosa restituire  nelle inverse!!!!*)
+			   
+	       
+             | "refRel"
+	     | "refSort" ->
+	     if inv then     (* restituisco gli uri che il valore della prop richiesta uguale a s *)
+               let res =
+               let c = pgc () in
+	       let q = ("select h" ^ mprop ^ ".uri from h" ^ mprop ^ " where h" ^ mprop ^ "." ^ prop ^ "= '" ^ s ^ "'") in
+	         print_endline q;
+		 pgresult_to_string_list (c#exec q)
+               in
+                 append (res,(property_ex rop path inv tl))
+               
+	     else
+	       let res =         (* restituisco il valore della prop relativo all'uri rappresentato da s*)
+               let c = pgc () in
+               let q = ("select h" ^ mprop ^ "." ^ prop ^" from h" ^ mprop ^ " where h" ^ mprop ^ ".uri = '" ^ s ^ "'") in
+                 pgresult_to_string_list (c#exec q)
+	       in
+                 append (res,(property_ex rop path inv tl))
+	       
+	     
+	     
+	     | _ ->        (* metadati DC  !!!! Controllare se i nomi delle tabelle cominciano con h !!!!*)
+	     if inv then
+               let res =
+               let c = pgc () in
+	       let q = ("select " ^ mprop ^ ".uri from " ^ mprop ^ " where " ^ mprop ^ ".value = '" ^ s ^ "'") in
+	         pgresult_to_string_list (c#exec q)
+               in
+                 append (res,(property_ex rop path inv tl))
+             else
+	       let res =
+               let c = pgc () in
+	       let q = ("select " ^ mprop ^ ".value from " ^ mprop ^ " where " ^ mprop ^ ".uri = '" ^ s ^ "'") in
+	         pgresult_to_string_list (c#exec q)
+               in
+                 append (res,(property_ex rop path inv tl))
+
+;;
+