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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ai-yuma.com/entry/2021/07/18/20210718_%E7%A6%8F%E5%B3%B69R_%E4%BF%A1%E5%A4%AB%E5%B1%B1%E7%89%B9%E5%88%A5_>