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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ketabchin.com/%D8%B9%D9%84%D9%88%D9%85-%D8%AA%D8%AC%D8%B1%D8%A8%DB%8C-%D9%87%D8%B4%D8%AA%D9%85/book/61085845>