<https://new-wolrd.com/2020/10/05/%e5%a4%a7%e5%9e%8b%e6%8a%98%e3%82%8a%e7%95%b3%e3%81%bf%e5%82%98/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://new-wolrd.com/2020/10/05/%E5%A4%A7%E5%9E%8B%E6%8A%98%E3%82%8A%E7%95%B3%E3%81%BF%E5%82%98/>