and generate new knowledge from repository content." Interoperability is achieved in the world of institutional repositories by using protocols such as OAI-PMH. This allows search engines and open access aggregators, such as BASE, CORE and Unpaywall, to index repository metadata and content and provide value-added services on top of this content. The Digital Commons Network aggregates by discipline some 500 institutional repositories running on the Bepress Digital Commons platform. It includes more than two million full-text objects. See also Digital Assets Repository – at Bibliotheca Alexandrina in Egypt Current research information system (CRIS) :Category:Open-access archives Library publishing Registry of Open Access Repositories Scholarly commons CORE (research service) References Further reading External links Ranking Web of World Repositories List of repository software on Libopedia Practical guidelines for starting an institutional repository Open access (publishing) Communication Academic publishing Research Open-access archives