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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://midad.com/articles/category/56014/%D8%A3%D8%AD%D9%83%D8%A7%D9%85-%D8%A7%D9%84%D8%B9%D9%8A%D8%AF%D9%8A%D9%86>