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diff --git a/helm/mathql_test/mQGTopLexer.mll b/helm/mathql_test/mQGTopLexer.mll
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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/.
+ *)
+
+(*  AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
+ *)
+
+{ 
+   open MQGTopParser
+   
+   let debug = false
+   
+   let out s = if debug then prerr_endline s
+}
+
+let SPC   = [' ' '\t' '\n']+
+let ALPHA = ['A'-'Z' 'a'-'z' '_']
+let NUM   = ['0'-'9']
+let IDEN  = ALPHA (NUM | ALPHA)*
+let QSTR  = [^ '"' '\\']+
+
+rule comm_token = parse
+   | "(*"         { comm_token lexbuf; comm_token lexbuf }
+   | "*)"         { () }
+   | ['*' '(']    { comm_token lexbuf }
+   | [^ '*' '(']* { comm_token lexbuf }
+and string_token = parse
+   | '"'          { DQ  }
+   | '\\' _       { STR (String.sub (Lexing.lexeme lexbuf) 1 1) }
+   | QSTR         { STR (Lexing.lexeme lexbuf) }
+   | eof          { EOF }
+and spec_token = parse
+   | "(*"         { comm_token lexbuf; spec_token lexbuf }
+   | SPC          { spec_token lexbuf }
+   | '"'          { let str = qstr string_token lexbuf in
+                    out ("STR " ^ str); STR str }
+   | '{'          { out "LC"; LC }
+   | '}'          { out "RC"; RC }
+   | ','          { out "CM"; CM }
+   | '$'          { out "DL"; DL }
+   | "mustobj"    { out "MOBJ"  ; MOBJ   }
+   | "mustsort"   { out "MSORT" ; MSORT  }
+   | "mustrel"    { out "MREL"  ; MREL   }
+   | "onlyobj"    { out "OOBJ"  ; OOBJ   }
+   | "onlysort"   { out "OSORT" ; OSORT  }
+   | "onlyrel"    { out "OREL"  ; OREL   }
+   | "universe"   { out "UNIV"  ; UNIV   } 
+   | IDEN         { let id = Lexing.lexeme lexbuf in 
+                    out ("ID " ^ id); ID id }
+   | eof          { EOF }