<https://inkjoy.com>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://inkjoy.com/blogs/news/%EA%B0%9C%EC%84%B1%EC%9E%88%EA%B3%A0-%EC%84%B8%EB%A0%A8%EB%90%9C-%EB%AA%85%ED%95%A8-%EB%94%94%EC%9E%90%EC%9D%B8>