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[helm.git] / helm / software / lambda-delta / toplevel / meta.ml

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+(* 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/.
+ *)
+
+type id = Aut.id
+
+type qid = id * id list (* qualified identifier: name, qualifiers *)
+
+type term = Sort of bool              (* sorts: true = TYPE, false = PROP *)
+         | LRef of int               (* local reference: de bruijn index *)
+         | GRef of qid * term list   (* global reference: name, arguments *)
+         | Appl of term * term       (* application: argument, function *)
+         | Abst of id * term * term  (* abstraction: name, type, body *)
+
+type pars = (qid * term) list (* parameter declarations: name, type *)
+
+(* environment: parameters, name, type, (transparent?, body) *)
+type environment = (pars * qid * term * (bool * term) option) list