<https://www.dogclover.com/post/\u30B9\u30BF\u30C3\u30D5\u3055\u3093\u304C\u3001\u53EF\u611B\u3044\u30A4\u30E9\u30B9\u30C8\u3092>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.dogclover.com/post/%E3%82%B9%E3%82%BF%E3%83%83%E3%83%95%E3%81%95%E3%82%93%E3%81%8C%E3%80%81%E5%8F%AF%E6%84%9B%E3%81%84%E3%82%A4%E3%83%A9%E3%82%B9%E3%83%88%E3%82%92>