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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shuttersmanufacturer.com/cn/blog/%E5%A6%82%E4%BD%95%E5%9C%A8%E6%88%BF%E5%B1%8B%E4%B8%8A%E4%BD%BF%E7%94%A8%E7%99%BE%E5%8F%B6%E7%AA%97/>