<https://www.amagoya.info/post/\u30AE\u30E3\u30E9\u30EA\u30FC\u4E00\u65B0-11>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.amagoya.info/post/%E3%82%AE%E3%83%A3%E3%83%A9%E3%83%AA%E3%83%BC%E4%B8%80%E6%96%B0-11>