<https://www.suginamikikai.jp/single-post/2020/10/19/\u30DF\u30CB\u904B\u52D5\u4F1A>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.suginamikikai.jp/single-post/2020/10/19/%E3%83%9F%E3%83%8B%E9%81%8B%E5%8B%95%E4%BC%9A>