<https://539hakui.net/2019/11/27/%e8%b5%b7%e5%ba%8a%e9%9f%b3%e6%a5%bd11%e6%9c%8827%e6%97%a5-3/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://539hakui.net/2019/11/27/%E8%B5%B7%E5%BA%8A%E9%9F%B3%E6%A5%BD11%E6%9C%8827%E6%97%A5-3/>