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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://libra-books.com/index-%D8%A2%D8%AF%D9%85-%D9%87%D8%A7-%D9%88-%D9%84%D8%A8%D8%A7%D8%B3%D9%87%D8%A7%DB%8C%D8%B4%D8%A7%D9%86>