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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://miya-road-bike.hatenablog.com/entry/2015/07/08/%E3%80%8C%E3%83%95%E3%82%A1%E3%83%83%E3%83%88%E3%83%95%E3%83%AA%E3%83%BC%E3%82%B6%E3%83%BC%E3%80%8D%E3%81%8C%E3%81%A3%E3%81%A1%E3%82%8A%E3%83%9E%E3%83%B3%E3%83%87%E3%83%BC%E3%81%A7%E7%B4%B9>