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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://mvnosimfree.info/%E3%82%A8%E3%82%AD%E3%82%B5%E3%82%A4%E3%83%88%E3%83%A2%E3%83%90%E3%82%A4%E3%83%AB/entry365.php>