<https://ringocpo.com/%e6%85%a2%e6%80%a7%e8%85%b0%e7%97%9b%e3%81%ae%e6%82%a9%e3%81%bf/1402/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ringocpo.com/%E6%85%A2%E6%80%A7%E8%85%B0%E7%97%9B%E3%81%AE%E6%82%A9%E3%81%BF/1402/>