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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.iforinterview.com/tag/%CE%AC%CE%B4%CE%B5%CE%B9%CE%B1-%CE%B1%CF%83%CE%B8%CE%B5%CE%BD%CE%B5%CE%AF%CE%B1%CF%82/>