Il catalogo connesso: dal silos di dati al network informativo

Library catalogs automation and bibliographic data management in electronic format have almost half a century of life. In recent years the media through which the information is spread, the conceptual models that describe the bibliographic universe, the structures of the data, the cataloging rules that provide guidance and constraints on the content of the data have changed. Through a diachronic overview of the evolution of the tool we still call OPAC, the purpose of this paper is to outline the state of the art and the future of library catalogs, focussing in particular on opening the catalog and data which contains the semantic web environment