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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://kuanglinzb.com/2021/05/02/%E5%86%B3%E6%88%98%E6%B2%99%E5%9F%8E%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E5%8F%AF%E4%BB%A5%E7%8E%A9%EF%BC%9F/>