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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://didgahnews.ir/tag/%D8%AC%D8%B1%DB%8C%D9%85%D9%87-%D8%AF%D9%86%D8%AF%D9%87-%D8%B9%D9%82%D8%A8-%D8%AF%D8%B1-%D8%A7%D8%AA%D9%88%D8%A8%D8%A7%D9%86>