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PMH has an operation listMetadataFormats which lists the local names and any other information it has about the formats it supports. eg: http://alcme.oclc.org/openurl/servlet/OAIHandler?verb=ListMetadataFormats (view source to see the response without the helpful XSLT) Eg, they have the problem, but don't even bother with a registry. Rob On Wed, 2009-05-20 at 15:30 +0100, Ray Denenberg, Library of Congress wrote: > From: "Dr R. Sanderson" <[log in to unmask]> > > There isn't one, but the protocol has the same requirements as SRU and > > OpenURL. > > I remain confused. If the protocol has the requirement to specify a schema > identifier, there must be some way for an implementor to (1) find out the > appropriate identifier for a particular schema, including finding out that > there isn't one; and (2) register an identifier for a schema when there > isn't one. > > --Ray