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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://manabecchi.com/2016/10/10/%E3%83%8A%E3%83%81%E3%83%A5%E3%83%A9%E3%83%AB%E3%82%B9%E3%83%88%E3%83%AC%E3%83%BC%E3%83%88%E2%98%86/>