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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.azhar.eg/magazine/home/ArtMID/1089/ArticleID/63721/%D9%88%D9%82%D9%81%D8%A7%D8%AA-%D9%85%D8%B9-%D9%84%D8%BA%D8%A9-%D8%A7%D9%84%D9%82%D8%B1%D8%A2%D9%86-%D9%85%D9%86-%D9%81%D9%88%D8%A7%D8%A6%D8%AF-%D8%A7%D9%84%D8%A7%D8%B3%D8%AA%D8%BA%D9%81%D8%A7%D8%B1>