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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://college.barsamath.com/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-%D8%A7%D8%B9%D8%AF%D8%A7%D8%AF-%D8%A8%D9%87-%DA%A9%D9%88%D8%AF%DA%A9%D8%A7%D9%86/>