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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hayashi-kochi.com/post/7%E6%9C%88%E3%81%AE%E4%BC%91%E8%A8%BA%E6%97%A5%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6-1>