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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kingk-monokoto.hatenablog.com/archive/category/%E8%BC%B8%E5%85%A5%E8%8F%93%E5%AD%90-%E7%A5%9E%E6%88%B8%E7%89%A9%E7%94%A3>