<https://anthony910096.pixnet.net/blog/post/33153001-%5b%e6%97%a5%e5%8a%87%5d-%e7%84%a1%e9%96%93%e9%9b%99%e9%be%8d-%2301-02>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://anthony910096.pixnet.net/blog/post/33153001>