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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.creativosonline.org/zh-CN/%E5%9C%A3%E8%AF%9E%E8%8A%82%E7%9A%8415%E7%A7%8D%E5%AE%8C%E7%BE%8E%E5%AD%97%E4%BD%93.html>