<https://onoda-shingakujuku.jp/2022/01/10/%e4%bb%8a%e6%97%a5%e3%81%af%e5%a1%be%e3%83%86%e3%82%b9%e3%83%88-2/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
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