<https://sumile202.com/%e3%81%99%e3%81%ae%e3%81%93%e3%83%99%e3%83%83%e3%83%89%e2%91%a6/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sumile202.com/%E3%81%99%E3%81%AE%E3%81%93%E3%83%99%E3%83%83%E3%83%89%E2%91%A6/>