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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://krtiptiptip.tistory.com/tag/%EC%A0%84%EA%B8%B0%EC%95%95%EB%A0%A5%EB%B0%A5%EC%86%A5%EB%B3%B4%EC%98%A8%EC%98%A8%EB%8F%84>