What is the difference between the versions of the OAI-PMH?
The initial version of the OAI-PMH, 1.0, was released in January 2001. A minor update version, 1.1, was released in July 2001 to conform to changes in the XML schema specification. The current version of the OAI-PMH, 2.0, was released in June 2002. Technical changes between the different versions are described in respective migration documents. The migration document for version 2.0 is available at http://www.openarchives.org/OAI/2.0/migration.htm. An executive summary of the technical changes in version 2.0 is available at http://www.openarchives.org/news/oaiv2press020614.html. In addition to technical changes, OAI-PMH version 2.0 also marks the end of the initial experimentation period for the protocol. This initial 18 month period was meant to test both the functional aspects of the protocol and the utility of the general notion of metadata harvesting. Substantial use of the OAI-PMH during that period has both validated metadata harvesting as a tool for information federation and pr
