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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://benriyasun.jp/2020/01/25/%E4%B8%8D%E7%94%A8%E5%93%81%E5%9B%9E%E5%8F%8E-%E6%88%90%E7%94%B0%E5%B8%82h%E6%A7%98-2/>