1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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15 * GNU General Public License for more details.
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22 * For details, see the HELM World-Wide-Web page,
23 * http://www.cs.unibo.it/helm/.
28 * implementazione del comando Relation
41 let get_prop_id propl =
42 let prop = List.hd propl in
43 if prop="refObj" then "F"
44 else if prop="backPointer" then "B"
49 let relation_ex rop path rset attl =
52 let usek = get_prop_id path in
53 let vvar = if attl = [] then "position"
57 let rset_list = (* lista di singoletti:resource_set di un elemento *)
58 (List.fold_left (fun acc (uri,l) ->
59 let tv = pgresult_to_string (c#exec ("select id from registry where uri='" ^ uri ^ "'")) in
60 let qq = "select uri, context from t" ^ tv ^ " where prop_id='" ^ usek ^ "' order by uri asc" in
61 let res = c#exec qq in
64 [uri;context] -> [(uri,[[(vvar,[context])]])]
71 let rec edup = function
73 | rs1::tl -> union_ex rs1 (edup tl)