I've put together a short discussion paper concerning identifiers for learning objects: http://www.ukoln.ac.uk/distributed-systems/lo-identifiers/ The intention is to try and build a list of our (the UK HE and FE community's) requirements for identifiers, which we can then use to assess the suitability of the available identifier technologies. The paper suggests an initial list of 10 requirements. Comments welcome... Andy -- Distributed Systems, UKOLN, University of Bath, Bath, BA2 7AY, UK http://www.ukoln.ac.uk/ukoln/staff/a.powell +44 1225 383933 Resource Discovery Network http://www.rdn.ac.uk/