<https://saiyouya.com/2020/12/11/eigyou_kitsui/%e4%bc%91%e6%97%a5%e8%bf%94%e4%b8%8a%e3%81%a7%e5%83%8d%e3%81%8f%e3%81%ae%e3%81%8c%e3%81%8d%e3%81%a4%e3%81%84/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://saiyouya.com/2020/12/11/eigyou_kitsui/%E4%BC%91%E6%97%A5%E8%BF%94%E4%B8%8A%E3%81%A7%E5%83%8D%E3%81%8F%E3%81%AE%E3%81%8C%E3%81%8D%E3%81%A4%E3%81%84/>