function init($xml, $fileattribs, $lastversion)
    {
        $this->_class = str_replace('/', '_', $fileattribs['name']);
        $this->_filename = $fileattribs['name'];
        $this->_class = str_replace ('.php', '', $this->_class) . '_postinstall';
        $this->_params = $xml;
        $this->_lastversion = $lastversion;
    }