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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ayumukai.sakura.ne.jp/wp/2020/11/07/%E9%9D%92%E7%A9%BA%E3%81%A4%E3%81%86%E3%81%97%E3%82%9310%E6%9C%88%E5%8F%B7/>