There isn't one, but the protocol has the same requirements as SRU and 
OpenURL.

Rob

On Tue, 19 May 2009, Ray Denenberg wrote:

> From: "Dr R. Sanderson" <[log in to unmask]>
>> Yes, in principle.  Also OAI-PMH metadata formats would be good to bring
>> into line as well.
>
> Can you point me to the OAI metadata format registry (I hunted around but
> can't find it).   Thanks.
>
> --Ray
>