<https://sensitive1228.pixnet.net/blog/post/289828334-%e7%97%9e%e5%ae%a2%e6%a8%a3%e5%bc%8f-09-pucca%e4%b8%ad%e5%9c%8b%e5%a8%83%e5%a8%83-%e6%a4%85%e5%ad%90%e7%89%88-%e4%b8%89%e6%ac%84%e5%bc%8f-%e5%85%a9%e6%ac%84>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sensitive1228.pixnet.net/blog/post/289828334>