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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://solutioncenter.apexsql.com/zh/%E8%AF%BB%E5%8F%96%E4%B8%80%E4%B8%AAsql-server%E4%BA%8B%E5%8A%A1%E6%97%A5%E5%BF%97/>