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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kujira-an.com/2021/11/09/%E3%82%A6%E3%82%A8%E3%82%A4%E3%83%88%E3%81%82%E3%82%8B%E3%83%BB%E3%81%AA%E3%81%84/>