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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://support.ec-magnet.com/hc/ja/articles/13883864513172-%E6%B6%88%E8%B2%BB%E7%A8%8E%E3%82%92%E8%A8%AD%E5%AE%9A%E3%81%99%E3%82%8B>