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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://nezutuma-robao.com/2021/06/07/%E3%83%86%E3%82%A3%E3%83%BC%E3%83%A9%E3%82%A4%E3%83%95%EF%BC%883172%EF%BC%89/>