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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://fidibo.com/books/author/%D9%85%D8%AD%D9%85%D8%AF-%D8%AC%D9%88%D8%A7%D8%AF-%D9%81%DB%8C%D8%B1%D9%88%D8%B2%DB%8C>