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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hardshopper.hatenablog.com/archive/category/%E3%83%AC%E3%82%B9%E3%83%88%E3%83%A9%E3%83%B3%E4%BA%88%E7%B4%84>