<https://www.kazu-dronegraphy.com/post/2018/03/03/\u5730\u4E0A\u64AE\u5F71\u306E\u5199\u771F\u63D0\u4F9B\u62C5\u5F53\u3057\u307E\u3057\u305F\uFF01>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.kazu-dronegraphy.com/post/2018/03/03/%E5%9C%B0%E4%B8%8A%E6%92%AE%E5%BD%B1%E3%81%AE%E5%86%99%E7%9C%9F%E6%8F%90%E4%BE%9B%E6%8B%85%E5%BD%93%E3%81%97%E3%81%BE%E3%81%97%E3%81%9F%EF%BC%81>