Create And D Drop Multiple Database

I am trying to install and uninstall the addon and in the addon.xml file i want to install and uninstall multiple tables, please help me how to fix it i am getting error when i install the file.

my code is below.

		
            CREATE TABLE `?:codesbar_clients` (
				`id` int(11) unsigned NOT NULL DEFAULT 0,
				`position` int(11) unsigned NOT NULL DEFAULT 0,
				`name` text NOT NULL DEFAULT '',
				`address` text NOT NULL DEFAULT '',
				`salestaxregno` text NOT NULL DEFAULT '',
				`ntnno` text NOT NULL DEFAULT '',
				`date` text NOT NULL DEFAULT '',
				PRIMARY KEY (`id`)
			) Engine=MyISAM DEFAULT CHARSET UTF8;
		
		
            CREATE TABLE `?:codesbar_clients_cash` (
				`id` int(11) unsigned NOT NULL DEFAULT 0,
				`position` int(11) unsigned NOT NULL DEFAULT 0,
				`invoice` text NOT NULL DEFAULT '',
				`dc` text NOT NULL DEFAULT '',
				`date` text NOT NULL DEFAULT '',
				`c` text NOT NULL DEFAULT '',
				`brand` text NOT NULL DEFAULT '',
				PRIMARY KEY (`id`)
			) Engine=MyISAM DEFAULT CHARSET UTF8;
		
		
            CREATE TABLE `?:codesbar_clients_salestax` (
				`id` int(11) unsigned NOT NULL DEFAULT 0,
				`position` int(11) unsigned NOT NULL DEFAULT 0,
				`invoice` text NOT NULL DEFAULT '',
				`dc` text NOT NULL DEFAULT '',
				`po` text NOT NULL DEFAULT '',
				`date` text NOT NULL DEFAULT '',
				`brand` text NOT NULL DEFAULT '',
				PRIMARY KEY (`id`)
			) Engine=MyISAM DEFAULT CHARSET UTF8;
		
        DROP TABLE IF EXISTS ?:codesbar_clients;
        DROP TABLE IF EXISTS ?:codesbar_clients_cash;
        DROP TABLE IF EXISTS ?:codesbar_clients_salestax`;
	

when i install i get error about last 2 items codesbar_clients_cash and codesbar_clients_salextax

What is the error you are getting?

Hello

In this line is error

for="uninstall">DROP TABLE IF EXISTS ?:codesbar_clients_salestax`;

Please remove char "`" from end of this line.

Best regards

Robert