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://cs.unibo.it/helm/.
26 type id = string (* identifier *)
28 type qid = id * bool * id list (* qualified identifier: name, is local?, qualifiers *)
30 type term = Sort of bool (* sorts: true = TYPE, false = PROP *)
31 | GRef of qid * term list (* reference: name, arguments *)
32 | Appl of term * term (* application: argument, function *)
33 | Abst of id * term * term (* abstraction: name, type, body *)
35 type item = Section of id option (* section: Some = open/reopen, None = close last *)
36 | Context of qid option (* context: Some = last node, None = root *)
37 | Block of id * term (* block opener: name, type *)
38 | Decl of id * term (* declaration: name, type *)
39 | Def of id * term * bool * term (* definition: name, type, transparent?, body *)
41 type book = item list (* book *)