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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ug.m.wikipedia.org/wiki/%D9%8A%DB%90%DA%AD%D9%89_%D9%8A%D9%89%D9%84_%D8%A8%D8%A7%D9%8A%D8%B1%D9%89%D9%85%D9%89>