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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.naokilog.com/2020/04/09/nexus-%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA%E3%81%AE%E3%83%8D%E3%83%BC%E3%83%9F%E3%83%B3%E3%82%B0%E8%A6%8F%E5%89%87/>