<https://www.goraku-sangyo.com/%e6%a9%9f%e6%a7%8b%e3%80%8010%e6%9c%88%e3%81%af%e7%ab%8b%e5%85%a5151%e5%ba%97%e8%88%97/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.goraku-sangyo.com/%E6%A9%9F%E6%A7%8B%E3%80%8010%E6%9C%88%E3%81%AF%E7%AB%8B%E5%85%A5151%E5%BA%97%E8%88%97/>