<https://castor0605.pixnet.net/blog/post/468178028-%e9%9b%aa%e7%8e%8b%e5%86%b0%e6%b7%87%e6%b7%8b%e4%be%9b%e6%87%89%e4%b8%ad%e5%bf%83>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://castor0605.pixnet.net/blog/post/468178028-%E9%9B%AA%E7%8E%8B%E5%86%B0%E6%B7%87%E6%B7%8B%E4%BE%9B%E6%87%89%E4%B8%AD%E5%BF%83>