New Trends in Databases and Information Systems 17th East European Conference on Advances in Databases and Information Systems - Catania, Barbara; Cerquitelli, Tania; Chiusano, Silvia; Guerrini, Giovanna; Kämpf, Mirko; Kemper, Alfons; Novikov, Boris; Palpanas, Themis; Pokorný, Jaroslav; Vakali, Athena (Springer International Publishing : Imprint: Springer, 2014)