protected function parseTag($line)
    {
        $tagAndValue = preg_split('/\\s/', $line, 2);
        $tag = substr($tagAndValue[0], 1);
        if (count($tagAndValue) > 1) {
            $this->tags[$tag][] = trim($tagAndValue[1]);
        } else {
            $this->tags[$tag] = [];
        }
    }