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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://inagon175.hatenablog.com/entry/2022/01/14/%E3%81%BE%E3%81%9F%E9%99%8D%E3%82%8A%E3%81%BE%E3%81%97%E3%81%9F%E3%80%82>