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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.chisatonakashima.com/post/%E3%81%A1%E3%81%84%E3%81%95%E3%81%AA%E9%9F%B3%E6%A5%BD%E5%8A%87%E5%A0%B4-2>