<https://www.greentime-ceramic.com/post/2018/07/18/\u30B9\u30E9\u30F3\u30D7\u30683\u65E5\u9593\u5411\u304D\u5408\u3046>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.greentime-ceramic.com/post/2018/07/18/%E3%82%B9%E3%83%A9%E3%83%B3%E3%83%97%E3%81%A83%E6%97%A5%E9%96%93%E5%90%91%E3%81%8D%E5%90%88%E3%81%86>