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.
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://www.cs.unibo.it/helm/.
26 (* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
29 (* output data structures ***************************************************)
31 module I : Avs.Type = ListAvs
33 type value = Avs.value (* a linearized attribute value *)
35 type path = Avs.path (* the name of an attribute *)
37 type group = I.group (* an group of attribures *)
39 type result = I.avs (* the query result *)
41 (* input data structures ****************************************************)
43 type svar = string (* the name of a variable for a resource set *)
45 type avar = string (* the name of a variable for a resource *)
49 type refine = RefineExact
57 type exp = path * (path option)
59 type exp_list = exp list
67 type gen = GenFJoin (* full union - with attr handling *)
68 | GenFMeet (* full intersection - with attr handling *)
70 type query = Const of (string * (path * query) list list) list
74 | Ex of avar list * query
75 | Select of avar * query * query
76 | Let of svar option * query * query
77 | Fun of path * path list * query list
78 | Gen of path * query list
79 | Add of bool * groups * query
80 | For of gen * avar * query * query
81 | While of gen * query * query
82 | Property of inverse * refine * path *
83 main * istrue * isfalse list * exp_list *
86 and groups = Attr of (path * query) list list
89 and con = pattern * path * query
93 and isfalse = con list