--- /dev/null
+(* 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/.
+ *)
+
+(* AUTORS: Ferruccio Guidi <fguidi@cs.unibo.it>
+ * Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>
+ *)
+
+(* $Id$ *)
+
+(* low level types *********************************************************)
+
+type uri = string
+type position = MainHypothesis
+ | InHypothesis
+ | MainConclusion
+ | InConclusion
+ | InBody
+type depth = int
+type sort = Set
+ | Prop
+ | Type
+ | CProp
+
+type spec = MustObj of uri list * position list * depth list
+ | MustSort of sort list * position list * depth list
+ | MustRel of position list * depth list
+ | OnlyObj of uri list * position list * depth list
+ | OnlySort of sort list * position list * depth list
+ | OnlyRel of position list * depth list
+ | Universe of position list
+
+(* high-level types ********************************************************)
+
+type optional_depth = int option
+
+type full_position = [ `MainHypothesis of optional_depth
+ | `MainConclusion of optional_depth
+ | `InHypothesis
+ | `InConclusion
+ | `InBody
+ ]
+
+type main_position = [ `MainHypothesis of optional_depth
+ | `MainConclusion of optional_depth
+ ]
+
+type r_obj = full_position * uri
+type r_sort = main_position * sort
+type r_rel = main_position
+
+type must_restrictions = (r_obj list * r_rel list * r_sort list)
+type only_restrictions =
+ (r_obj list option * r_rel list option * r_sort list option)
+
+type universe = position list