<https://okawari-lab.net/archives/category/%e5%9c%b0%e5%9f%9f/%e4%b9%9d%e5%b7%9e/%e5%ae%ae%e5%b4%8e%e7%9c%8c#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://okawari-lab.net/archives/category/%E5%9C%B0%E5%9F%9F/%E4%B9%9D%E5%B7%9E/%E5%AE%AE%E5%B4%8E%E7%9C%8C>