<https://www.ish-lab.com/post/\u516C\u958B\u30B5\u30A4\u30C8\u3084\u30B9\u30DE\u30DB\u304B\u3089\u8A18\u4E8B\u3092\u4F5C\u6210>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ish-lab.com/post/%E5%85%AC%E9%96%8B%E3%82%B5%E3%82%A4%E3%83%88%E3%82%84%E3%82%B9%E3%83%9E%E3%83%9B%E3%81%8B%E3%82%89%E8%A8%98%E4%BA%8B%E3%82%92%E4%BD%9C%E6%88%90>