This paper describes work being carried out in the fields of online education provision and library systems, beginning with a description of the current state of the art with regard to online learning environments and educational materials management. Suggestions and solutions for librarians dealing with the management of educational digital content for education service providers are presented, including cooperation and collaboration, linking publishers and national bibliographies, MARC and metadata, and union catalogs/virtual union catalogs. An overview is provided of UNIverse, a European-funded project that is developing a library system to support a virtual union catalog and that offers mechanisms for facilitating cataloging activities by enabling record supply. The paper then focuses on the experiences of a sub-group of the UNIverse project, headed by the National Library of Greece, to test and evaluate the record sharing capabilities of the system and collaborative cataloging in practice. (Contains 24 references.) (MES)