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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://na-coach.com/2020/09/17/%E3%81%AA%E3%82%8A%E3%81%9F%E3%81%84%E8%87%AA%E5%88%86%E3%81%AB%E3%81%AA%E3%82%8B%E8%BF%91%E9%81%93/>