<https://yanopiano.com/author/piano/#author>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://yanopiano.com/2019/04/09/%E3%82%B8%E3%83%A3%E3%82%BA%E3%83%94%E3%82%A2%E3%83%8E%E3%80%81%E3%83%A9%E3%82%A4%E3%83%96/>