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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://infoiguassu.tistory.com/tag/%EB%B8%8C%EB%9D%BC%EC%A7%88%20%EC%9D%B8%EA%B8%B0%20%EC%97%B0%EC%98%88%EC%9D%B8%EB%93%A4>