<https://hopeacademy-kagawa.net/blog/%e5%a4%8f%e4%bc%91%e3%81%bf%e3%81%ae%e5%ae%bf%e9%a1%8c/attachment/5194974_s/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hopeacademy-kagawa.net/blog/%E5%A4%8F%E4%BC%91%E3%81%BF%E3%81%AE%E5%AE%BF%E9%A1%8C/attachment/5194974_s/>