Example image of eyePlorer eyePlorer map for 'Open Archives Initiative Protocol for Metadata Harvesting': Open Archives Initiative Metadata Dublin Core Digital library Ghent University Los Alamos National Laboratory OAI Cornell University Ithaca, New York Berlin Washington, D.C. World Wide Web Consortium XML Web search engine Google OAIster Sitemaps Apache HTTP Server Mod oai Client-server Desire2Learn DSpace EPrints Fedora (software) Massachusetts Institute of Technology Open Journal Systems Public Knowledge Project University of Pisa University of Southampton ArXiv CERN Geneva Library of Congress Digital Library project METS National Digital Information Infrastructure and Preservation Program Preservation Metadata: Implementation Strategies (PREMIS) Open archive Citebase BASE (search engine) CogPrints Institutional repository PKP Open Archives Harvester Postprints NewGenLib ScientificCommons Libertas Academica PANGAEA (data library) Digital Library of Slovenia Open Archives Initiative Object Reuse and Exchange Nature Precedings