> How did OAI handle the 1.0, 1.1, 2.0 transitions? From the OAI FAQ - they didn't: "Is version 2.0 of OAI-PMH compatible with earlier versions? OAI-PMH version 2.0 is not backward compatible. Results from the version 1.x experimentation period indicated that a number of fundamental changes were necessary, and maintaining backward compatibility would have resulted in a compromised production release. We are committed to strongly consider backward compatibility issues in future releases." Matthew