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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://its.tistory.com/tag/%EB%B0%94%EB%9E%8C%20%EB%85%B8%EB%9E%98%20%EB%AE%A4%EC%A7%81%EB%B9%84%EB%94%94%EC%98%A4>