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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ko.m.wikipedia.org/wiki/%EC%82%B0%EB%B2%A0%EB%84%A4%EB%8D%B0%ED%86%A0%EB%8D%B8%ED%8A%B8%EB%A1%A0%ED%86%A0>