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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.shipfriends.gr/forum/topic/1466-%CE%BD%CE%AC%CE%BE%CE%BF%CF%82-%CF%84%CE%B6%CE%B5%CF%84-imo-8919518/?tab=comments#comment-35035>