As Rob says, there is no 'official' registry for OAI metadata
identifiers, but I maintain a registry of OAI data providers which is
maintained by querying the actual OAI data providers:
http://gita.grainger.uiuc.edu/registry/.

To get an idea of the extent of the metadata madness take a look at this
report: http://gita.grainger.uiuc.edu/registry/ListSchemas.asp

Kind regards,
Tom
>
>
>
> Rob Sanderson wrote:
>> 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
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>