<https://standard-made.jp/blog/%e3%80%90stdard-made-newarrival%e3%80%91-13#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://standard-made.jp/blog/%E3%80%90stdard-made-newarrival%E3%80%91-13>