--- /dev/null
+<?php // $Id$
+
+///////////////////////////////////////////////////////////////////////////
+// //
+// NOTICE OF COPYRIGHT //
+// //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment //
+// http://moodle.com //
+// //
+// Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
+// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
+// //
+// This program 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. //
+// //
+// This program 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: //
+// //
+// http://www.gnu.org/copyleft/gpl.html //
+// //
+///////////////////////////////////////////////////////////////////////////
+
+// This library includes all the required functions used to handle the DB
+// structure independently of the underlying RDBMS in use. All the functions
+// rely on the XMLDBDriver classes to be able to generate the correct SQL
+// syntax needed by each DB.
+//
+// To define any structure to be created we'll use the schema defined
+// by the XMLDB classes, for tables, fields, indexes, keys and other
+// statements instead of direct handling of SQL sentences.
+//
+// This library should be used, exclusively, by the installation and
+// upgrade process of Moodle.
+//
+// For further documentation, visit http://docs.moodle.org/en/DDL_functions
+
+?>