<https://np-schools.com/tag/%e5%8c%97%e3%81%ae%e6%9d%9c%e5%ad%a6%e5%9c%92%e3%80%80%e7%be%a9%e5%8b%99%e6%95%99%e8%82%b2%e5%ad%a6%e6%a0%a1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://np-schools.com/tag/%E5%8C%97%E3%81%AE%E6%9D%9C%E5%AD%A6%E5%9C%92%E3%80%80%E7%BE%A9%E5%8B%99%E6%95%99%E8%82%B2%E5%AD%A6%E6%A0%A1>