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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ajd.co.kr/community/qna/detail/%EB%8C%80%EC%B9%AD_%EB%B9%84%EB%8C%80%EC%B9%AD_%EB%AC%B8%EC%9D%98_%EB%93%9C%EB%A6%BD%EB%8B%88%EB%8B%A4.-25289>