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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.ulifestyle.com.hk/article/annieexplorer/4178897/%E5%AE%89%E5%A6%AE%E7%BE%8E%E5%AE%B9-pola%E5%86%AC%E6%97%A5%E7%BE%8E%E7%99%BD>