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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.iranianacm.ir/fa/digitallibrary/7/%D9%85%D8%AC%D9%84%D9%87-%D8%B4%D9%87%D8%AF47-%D8%AA%DB%8C%D8%B1-1399>