<https://takuvanyiing.pixnet.net/blog/post/24073519-%e3%80%90%e7%8d%a8%e7%ab%8b%e5%a5%ae%e9%ac%a5%e6%9c%9f%e3%80%91%e4%b8%8a%e7%8f%ad%e7%ac%ac52%e6%97%a5%ef%bc%8c%e8%a4%87%e8%a9%a6%e6%9c%89%e9%bb%9e%e5%bf%99%e3%80%81%e5%b7%a5>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://takuvanyiing.pixnet.net/blog/post/24073519>