1 (* Copyright (C) 2004-2005, 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.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
30 (** @return l2 \ l1 *)
31 let uri_list_diff l2 l1 =
32 let module S = UriManager.UriSet in
33 let s1 = List.fold_left (fun set uri -> S.add uri set) S.empty l1 in
34 let s2 = List.fold_left (fun set uri -> S.add uri set) S.empty l2 in
35 let diff = S.diff s2 s1 in
36 S.fold (fun uri uris -> uri :: uris) diff []
38 let initial_status lexicon_status baseuri =
39 (new GrafiteTypes.status baseuri)#set_lstatus lexicon_status#lstatus
42 let time_travel ~present ?(past=initial_status present present#baseuri) () =
43 NCicLibrary.time_travel past
46 let init lexicon_status =
47 initial_status lexicon_status