<https://starlingear.net/blog/2018%e5%b9%b4%e6%9c%80%e5%be%8c%e3%81%ae%e7%b7%8a%e6%80%a5%e5%85%a5%e8%8d%b7%ef%bc%81%ef%bc%81/>
<http://schema.org/inLanguage>
"ja"
<https://starlingear.net/blog/2018%E5%B9%B4%E6%9C%80%E5%BE%8C%E3%81%AE%E7%B7%8A%E6%80%A5%E5%85%A5%E8%8D%B7%EF%BC%81%EF%BC%81/>