--- /dev/null
+(* 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))
+
+;;
+