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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://samsungdigitalcity.tistory.com/category/%EC%A0%95%EB%B3%B4%EB%A5%BC%20%EC%A0%84%ED%95%98%EB%8B%A4/%EA%B1%B4%EA%B0%95%20%ED%94%8C%EB%9F%AC%EC%8A%A4>