<https://www.saiki-tosou.jp/blog/7345/attachment/f7d5453e-0f00-4ac4-87e7-8fe4dfe43f84/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.saiki-tosou.jp/blog/7345/attachment/f7d5453e-0f00-4ac4-87e7-8fe4dfe43f84/>