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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://rawfree.net/raw-chapter/%E3%83%A9%E3%82%A4%E3%82%A2%E3%83%BC%E3%83%BB%E3%83%A9%E3%82%A4%E3%82%A2%E3%83%BC-raw-%E3%80%90%E7%AC%AC12%E8%A9%B1%E3%80%91/>