<https://www.chiba-goudou.org/%e6%98%a0%e7%94%bb%e7%b4%b9%e4%bb%8b%e3%80%8e%e5%b8%8c%e6%9c%9b%e3%81%ae%e7%81%af%e3%82%8a%e3%80%8f/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.chiba-goudou.org/%E6%98%A0%E7%94%BB%E7%B4%B9%E4%BB%8B%E3%80%8E%E5%B8%8C%E6%9C%9B%E3%81%AE%E7%81%AF%E3%82%8A%E3%80%8F/>