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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://caswac1.tistory.com/category/%EB%B0%B0%ED%8F%AC%EC%A4%91%EB%8B%A8/%EB%B8%94%EB%9E%99%20%EB%93%9C%EB%A6%BC>