<https://natasha790708.pixnet.net/blog/post/54521221-%e5%aa%bd%e5%aa%bd%e7%a6%ae%e6%9c%8d%e5%87%ba%e7%a7%9f%e6%8e%a8%e8%96%a6%ef%bd%9c%e5%8f%b0%e4%b8%ad-your-love-%e4%be%91%e6%a8%82%e7%b2%be%e5%93%81%e7%a6%ae>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://natasha790708.pixnet.net/blog/post/54521221>