protected function getMetaContent()
    {
        if ($this->mdFile && !file_exists($this->mdFile)) {
            throw new ArchException('Wrong markdown file [' . $this->mdFile . ']');
        }
        if ($this->mdFile && !$this->getContent()) {
            return Container::getMarkdown()->file($this->mdFile, $this->separator);
        } else {
            $txt = '';
            if ($this->mdFile) {
                $txt .= file_get_contents($this->mdFile);
            }
            if ($this->getContent()) {
                $txt .= "\n" . $this->getContent();
            }
            return Container::getMarkdown()->txt($txt, $this->separator);
        }
    }