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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://karimsystem.com/tag/%D8%AA%D8%B9%D9%85%DB%8C%D8%B1-%D8%B6%D8%A8%D8%B7-%D8%AC%DB%8C%D9%BE/>