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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.elriwaktn.com/2019/01/17/%D8%B4%D8%B1%D9%88%D8%B7-%D8%A7%D9%84%D8%A7%D9%86%D8%AA%D9%81%D8%A7%D8%B9-%D8%A8%D8%A7%D9%84%D9%85%D8%B3%D9%83%D9%86-%D8%A7%D9%84%D8%A3%D9%88%D9%84-%D9%88-%D8%A7%D9%84%D9%82%D8%B1/>