<https://gogocartw.pixnet.net/blog/post/289454456-%e9%a3%9f%e5%b0%9a%e7%8e%a9%e5%ae%b6-2012-06-11-%e9%ab%98%e9%9b%84%e9%87%8c%e9%95%b7%e5%83%91%e4%b9%8e%e4%bd%a0-%e6%9a%97%e6%a7%93%e7%be%8e%e9%a3%9f>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://gogocartw.pixnet.net/blog/post/289454456>