-<!-- 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 -->
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-<!-- 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. -->
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-<!-- 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. -->
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-<!-- For details, see the HELM World-Wide-Web page, -->
-<!-- http://cs.unibo.it/helm/. -->
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-<!--*****************************************************************-->
-<!-- DTD FOR CIC OBJECTS: -->
-<!-- First draft: September 1999, Claudio Sacerdoti Coen -->
-<!-- Revised: February 3 2000, Claudio Sacerdoti Coen, Irene Schena -->
-<!-- Last Revision: April 4 2000, Claudio Sacerdoti Coen -->
-<!-- Last Revision: June 19 2000, Claudio Sacerdoti Coen -->
-<!-- Last Revision: June 20 2000, Claudio Sacerdoti Coen -->
-<!--*****************************************************************-->