<https://www.futako-sss.com/post/\u30D5\u30C3\u30C8\u30B5\u30EB\u90E8-\u6771\u6025\u3061\u3073\u3063\u3053\u30D5\u30C3\u30C8\u30B5\u30EB\u5927\u4F1A>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.futako-sss.com/post/%E3%83%95%E3%83%83%E3%83%88%E3%82%B5%E3%83%AB%E9%83%A8-%E6%9D%B1%E6%80%A5%E3%81%A1%E3%81%B3%E3%81%A3%E3%81%93%E3%83%95%E3%83%83%E3%83%88%E3%82%B5%E3%83%AB%E5%A4%A7%E4%BC%9A>