<https://lovelyhebe.pixnet.net/blog/post/52408936-%5b%e5%bd%a9%e5%a6%9d%e2%99%a5%e5%90%88%e4%bd%9c%5d-%e5%a6%82%e5%90%8c%e8%ab%87%e6%88%80%e6%84%9b%e8%88%ac%e7%9a%84%e5%a5%bd%e8%86%9a%e8%b3%aa%e5%a5%bd%e8%87%89%e8%89%b2->
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://lovelyhebe.pixnet.net/blog/post/52408936>