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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sekitoba1007.hatenablog.com/archive/category/%E5%81%A5%E5%BA%B7%2F%E3%83%80%E3%82%A4%E3%82%A8%E3%83%83%E3%83%88>