<https://marusei-tech.net/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://marusei-tech.net/%E8%97%A4%E6%B2%A2%E5%B8%82%E3%81%AE%E5%B1%8B%E6%A0%B9%E5%B7%A5%E4%BA%8B%E5%B0%82%E9%96%80%E5%BA%97/>