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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.laliberte-nara.com/post/3%E6%9C%8815%E6%97%A5%E3%81%BE%E3%81%A7%E3%81%AE%E3%82%B9%E3%82%B1%E3%82%B8%E3%83%A5%E3%83%BC%E3%83%AB>