host_danube/danube/page/default_page/default_page.php

<?php

class default_page extends SYSTEM\PAGE\Page {
    public function html(){
        $vars = array();                        
        $vars['content'] = "";
        return SYSTEM\PAGE\replace::replaceFile(SYSTEM\SERVERPATH(new PPAGE(),'default_page/danube.tpl'), $vars);
    }
}