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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://mistyfriday.tistory.com/tag/%EB%B6%80%EC%82%B0%20%EC%82%AC%EC%A7%84%EC%B0%8D%EA%B8%B0%20%EC%A2%8B%EC%9D%80%20%EA%B3%B3>