<https://www.nissymusica.com/post/2018/10/26/\u30C6\u30EB\u30DF\u30F3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.nissymusica.com/post/2018/10/26/%E3%83%86%E3%83%AB%E3%83%9F%E3%83%B3>