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Interoperability is one of the main issues in creating a networked system of repositories The approaches range from simply forcing one metadata standard on all participating repositories to highly sophisticated semantic web based architectures with full semantic mapping capabilities between different schemas. The eduSource project in its holistic approach to building a network of learning object repositories in Canada is implementing an open network for learning services. Its openness isdoi:10.1145/967900.968094 dblp:conf/sac/HatalaREW04 fatcat:bvvwz4hhkzfalhfxilvl42come