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diff --git a/helm/ocaml/mathql_generator/mQGTypes.ml b/helm/ocaml/mathql_generator/mQGTypes.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/.
+ *)
+
+(*  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