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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://syrinx11.tistory.com/entry/%EC%A7%80%EB%A6%AC%EC%82%B0-%EB%85%B8%EA%B3%A0%EB%8B%A8-x-%EB%82%A8%EC%9B%90>