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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.arabapps.org/2018/03/%D8%A2%D8%A8%D9%84-%D8%B6%D8%AF-%D8%B3%D8%A7%D9%85%D8%B3%D9%88%D9%86%D8%AC-%D8%A3%D9%8A%D9%87%D9%85%D8%A7-%D8%A3%D9%81%D8%B6%D9%84-%D9%85%D9%86-%D8%AD%D9%8A%D8%AB-%D8%A7%D9%84%D8%B3%D9%84%D8%A7/>