<https://bigitoh.net/author/donchan/#author>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bigitoh.net/2020/02/16/%E3%81%8A%E3%81%AB%E3%81%8E%E3%82%8A%E3%83%91%E3%83%BC%E3%83%86%E3%82%A3%E3%83%BC/>