SWORD also has this exact same issue, I discover today.

Eg:
http://www.swordapp.org/docs/sword-type-1.0.html

These are packaging formats rather than document formats, but the
scenario is identical.

A quick list then: SRU, OAI-PMH, OpenURL, SWORD

Rob

On Wed, 2009-05-20 at 16:17 +0100, Hammond, Tony wrote:
> Hi Rob:
>
> Yes, indeed they do.
>
> We've just put up an OAI server and are using PAM but as yet have no URI for
> that:
>
> http://www.nature.com/oai/request?verb=ListMetadataFormats
>
> In fact I'm on a call in an hour with the PRISM folks to address just this
> issue. Hoping to get a URL for the schema so that we can register with SRU
> (with an SRU style identifier at this time).
>
> Cheers,
>
> Tony
>
>
>
>
>
> On 20/5/09 15:52, "Rob Sanderson" <[log in to unmask]> 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