Metadata and Semantic Research 12th International Conference, MTSR 2018, Limassol, Cyprus, October 23-26, 2018, Revised Selected Papers - Garoufallou, Emmanouel; Garoufallou, Emmanouel; Sartori, Fabio; Sartori, Fabio; Siatri, Rania; Siatri, Rania; Zervas, Marios; Zervas, Marios (Springer International Publishing : Imprint: Springer, 2019)