<https://onceinalife2014.pixnet.net/blog/post/302153094-%e3%80%90%e9%96%b1%e8%ae%80%e3%80%91%e4%ba%a6%e8%88%92267---%e5%a1%94%e8%a3%8f%e7%9a%84%e5%85%ad%e6%9c%88>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://onceinalife2014.pixnet.net/blog/post/302153094>