<https://tyoushikun.net/archives/category/%e5%9f%ba%e6%9c%ac%e6%83%85%e5%a0%b1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tyoushikun.net/archives/category/%E5%9F%BA%E6%9C%AC%E6%83%85%E5%A0%B1>