protected function _parseExtendsMain() {
        $content = file_get_contents($this->_parent->getFile());
        $this->_content = preg_replace('`' . $this->_openTag . $this->_name . preg_quote($this->markup['extends'][3]) . $this->_space . '/' . $this->_closeTag . '`isU', $this->_content, $content);
    }