CS-Cart Advanced Add-on Tutorial

addon.xml

<?xml version="1.0"?>
<addon scheme="2.0">
	<id>advanced_addon</id>
	<name>Advanced Add-on</name>
	<description>Advanced Add-on</description>
	<version>1.0</version>
	<priority>100500</priority>
	<status>active</status>
	<queries>
        <item for="install">DROP TABLE IF EXISTS ?:advanced_addon_data;</item>
		<item for="install">
            CREATE TABLE `?:advanced_addon_data` (
				`user_id` int(11) unsigned NOT NULL DEFAULT 0,
				`categories` text NOT NULL DEFAULT '',
				PRIMARY KEY (`user_id`)
			) Engine=MyISAM DEFAULT CHARSET UTF8;
		</item>
        <item for="uninstall">DROP TABLE IF EXISTS ?:advanced_addon_data;</item>
	</queries>
</addon>