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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://team.inria.fr/oak/2015/06/01/vldb-2015-reformulation-based-query-answering-in-rdf-alternatives-and-performance/?yr=2020&month=8&dy&cid=mc_mini_widget-3&mcat=4,5,7>