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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://yawatakomaginu.hatenablog.com/archive/category/%E4%BD%93%E5%A4%96%E5%BE%AA%E7%92%B0%E8%AA%8D%E5%AE%9A%E5%A3%AB>