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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hesabras.com/fa/article/18/%D8%AD%D8%B3%D9%86-%D8%B3%D8%AC%D8%A7%D8%AF%DB%8C-%D9%86%DA%98%D8%A7%D8%AF>