diff --git a/install-dev/upgrade/classes/ToolsInstall.php b/install-dev/upgrade/classes/ToolsInstall.php
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+<?php
+/*
+* 2007-2012 PrestaShop
+*
+* NOTICE OF LICENSE
+*
+* This source file is subject to the Open Software License (OSL 3.0)
+* that is bundled with this package in the file LICENSE.txt.
+* It is also available through the world-wide-web at this URL:
+* http://opensource.org/licenses/osl-3.0.php
+* If you did not receive a copy of the license and are unable to
+* obtain it through the world-wide-web, please send an email
+* to license@prestashop.com so we can send you a copy immediately.
+*
+* DISCLAIMER
+*
+* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+* versions in the future. If you wish to customize PrestaShop for your
+* needs please refer to http://www.prestashop.com for more information.
+*
+*  @author PrestaShop SA <contact@prestashop.com>
+*  @copyright  2007-2012 PrestaShop SA
+*  @version  Release: $Revision$
+*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+*  International Registered Trademark & Property of PrestaShop SA
+*/
+
+
+
+class ToolsInstall
+{
+	/**
+			 * Converts a simpleXML element into an array. Preserves attributes and everything.
+			 * You can choose to get your elements either flattened, or stored in a custom index that
+			 * you define.
+			 * For example, for a given element
+			 * <field name="someName" type="someType"/>
+			 * if you choose to flatten attributes, you would get:
+			 * $array['field']['name'] = 'someName';
+			 * $array['field']['type'] = 'someType';
+			 * If you choose not to flatten, you get:
+			 * $array['field']['@attributes']['name'] = 'someName';
+			 * _____________________________________
+			 * Repeating fields are stored in indexed arrays. so for a markup such as:
+			 * <parent>
+			 * <child>a</child>
+			 * <child>b</child>
+			 * <child>c</child>
+			 * </parent>
+			 * you array would be:
+			 * $array['parent']['child'][0] = 'a';
+			 * $array['parent']['child'][1] = 'b';
+			 * ...And so on.
+			 * _____________________________________
+			 * @param simpleXMLElement $xml the XML to convert
+			 * @param boolean $flattenValues    Choose wether to flatten values
+			 *                                    or to set them under a particular index.
+			 *                                    defaults to true;
+			 * @param boolean $flattenAttributes Choose wether to flatten attributes
+			 *                                    or to set them under a particular index.
+			 *                                    Defaults to true;
+			 * @param boolean $flattenChildren    Choose wether to flatten children
+			 *                                    or to set them under a particular index.
+			 *                                    Defaults to true;
+			 * @param string $valueKey            index for values, in case $flattenValues was set to
+							*                            false. Defaults to "@value"
+			 * @param string $attributesKey        index for attributes, in case $flattenAttributes was set to
+							*                            false. Defaults to "@attributes"
+			 * @param string $childrenKey        index for children, in case $flattenChildren was set to
+							*                            false. Defaults to "@children"
+			 * @return array the resulting array.
+			 */
+	static public function simpleXMLToArray ($xml, $flattenValues = true, $flattenAttributes = true, $flattenChildren = true, $valueKey = '@value', $attributesKey = '@attributes', $childrenKey = '@children')
+	{
+		$return = array();
+		if (!($xml instanceof SimpleXMLElement))
+			return $return;
+
+		$name = $xml->getName();
+		$_value = trim((string)$xml);
+		if (strlen($_value) == 0)
+			$_value = null;
+
+		if ($_value !== null)
+		{
+			if (!$flattenValues)
+				$return[$valueKey] = $_value;
+			else
+				$return = $_value;
+		}
+
+		$children = array();
+		$first = true;
+		foreach($xml->children() as $elementName => $child)
+		{
+			$value = ToolsInstall::simpleXMLToArray($child, $flattenValues, $flattenAttributes, $flattenChildren, $valueKey, $attributesKey, $childrenKey);
+			if (isset($children[$elementName]))
+			{
+				if ($first)
+				{
+					$temp = $children[$elementName];
+					unset($children[$elementName]);
+					$children[$elementName][] = $temp;
+					$first=false;
+				}
+				$children[$elementName][] = $value;
+			}
+			else
+				$children[$elementName] = $value;
+		}
+
+		if (count($children) > 0 )
+		{
+			if (!$flattenChildren)
+				$return[$childrenKey] = $children;
+			else
+				$return = array_merge($return, $children);
+		}
+
+		$attributes = array();
+		foreach($xml->attributes() as $name => $value)
+			$attributes[$name] = trim($value);
+
+		if (count($attributes) > 0)
+		{
+			if (!$flattenAttributes)
+				$return[$attributesKey] = $attributes;
+			else
+				$return = array_merge($return, $attributes);
+		}
+
+		return $return;
+	}
+}