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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.smile-marumi.com/entry/2020/11/20/%E3%82%B3%E3%83%A1%E3%83%80%E7%8F%88%E7%90%B2%E5%BA%97%E3%81%A7%E3%83%A2%E3%83%BC%E3%83%8B%E3%83%B3%E3%82%B0>