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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://matsuo-ehime.com/2022/05/09/%E3%81%84%E3%81%96%E3%81%A8%E3%81%84%E3%81%86%E6%99%82%E3%81%AB%E5%82%99%E3%81%88%E3%81%A6/>