<https://m0qt0bys.pixnet.net/blog/post/328854828-%e5%a6%82%e4%bd%95%e6%95%b4%e5%90%88%e8%b2%a0%e5%82%b5-%e9%8a%80%e8%a1%8c%e6%95%b4%e5%90%88%e8%b2%a0%e5%82%b5%e6%a2%9d%e4%bb%b6-%e6%9c%89%e9%97%9c%e6%96%bc%e4%bc%81%e6%a5%ad>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://m0qt0bys.pixnet.net/blog/post/328854828>