<https://omi8.net/#organization>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://omi8.net/210414-50off/210414%E9%B4%89%E3%81%AE%E7%A4%BE%E5%89%B2%E5%BC%95%E3%83%81%E3%82%B1%E3%83%83%E3%83%88c>