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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://steam-kouryaku.com/post-1175/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-203>