<https://www.atoppos-sp.com/blog_cat/%e8%83%b8%e5%bc%b5%e3%82%8a%e3%81%ae%e6%81%a9%e6%81%b5/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.atoppos-sp.com/blog_cat/%E8%83%B8%E5%BC%B5%E3%82%8A%E3%81%AE%E6%81%A9%E6%81%B5/>