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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://isignal.ir/tutorial/%D9%88%D8%A7%D9%85-%D9%81%D9%88%D8%B1%DB%8C-%D9%82%D8%B1%D8%B6-%D8%A7%D9%84%D8%AD%D8%B3%D9%86%D9%87/>