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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ar.wikiversity.org/wiki/%D8%A7%D9%84%D8%B5%D9%81%D8%AD%D8%A9_%D8%A7%D9%84%D8%B1%D8%A6%D9%8A%D8%B3%D9%8A%D8%A9>