<https://www.benriya.info/single-post/2017/12/20/\u4F50\u5009\u5E02\u306B\u3042\u308B\u30A2\u30D1\u30FC\u30C8\u304B\u3089\u5BB6\u5177\u306E\u79FB\u52D5>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.benriya.info/single-post/2017/12/20/%E4%BD%90%E5%80%89%E5%B8%82%E3%81%AB%E3%81%82%E3%82%8B%E3%82%A2%E3%83%91%E3%83%BC%E3%83%88%E3%81%8B%E3%82%89%E5%AE%B6%E5%85%B7%E3%81%AE%E7%A7%BB%E5%8B%95>