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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://rennge.hatenablog.com/entry/2022/08/01/%E5%86%B7%E9%BA%BA%3D%E5%86%B7%E3%82%84%E3%81%97%E4%B8%AD%E8%8F%AF>