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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://readymadeis.tistory.com/tag/%EC%86%A1%EC%A4%91%EA%B8%B0%20%EC%86%A1%ED%98%9C%EA%B5%90%20%EA%B2%B0%ED%98%BC>