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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://akinagayasuzi.com/2021/04/22/%E3%81%8A%E3%81%AF%E3%82%88%E3%81%86%E3%81%94%E3%81%96%E3%81%84%E3%81%BE%E3%81%99-19/>