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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://tech-one.asia/2017/10/29/%E5%85%AB%E7%8E%8B%E5%AD%90%E5%B8%82%E3%81%AE%E3%81%8A%E5%AE%A2%E6%A7%98%E3%80%80%E3%82%B8%E3%83%A3%E3%82%AC%E3%83%BC%E3%82%AC%E3%83%B3%E3%83%A1%E3%82%BF%E3%83%9B%E3%82%A4%E3%83%BC%E3%83%AB%E5%82%B7/>