Allows you to control menu item alias and have short SEF URLs without including aliases of parent menu items. Removes menu items aliases from articles URLs leaving only single article alias. Joomla native routing is not quite robust and you can't control how the SEF URL of menu item is built. You can only define menu item alias - a component of URL. By default aliases of Joomla menu items are relative: aliases of all parent menu items are auto-prepended to SEF URL.