<https://jetnotateuri.com/%e5%af%92%e7%94%b0b%e3%80%80%e5%a4%96%e8%a6%b3-2/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://jetnotateuri.com/%E5%AF%92%E7%94%B0b%E3%80%80%E5%A4%96%E8%A6%B3-2/>