<https://hiyosi.net/tag/%e5%a4%a7%e6%9b%bd%e6%a0%b9%e5%95%86%e5%ba%97%e8%a1%97/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hiyosi.net/tag/%E5%A4%A7%E6%9B%BD%E6%A0%B9%E5%95%86%E5%BA%97%E8%A1%97/>