<https://www.kinoieseven.com/post/\u98DF\u5353\u5468\u308A\u306E\u53CE\u7D0D>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.kinoieseven.com/post/%E9%A3%9F%E5%8D%93%E5%91%A8%E3%82%8A%E3%81%AE%E5%8F%8E%E7%B4%8D>