> Well, if by jcr:uuid you mean a canonical, unique identifier for the
> resource, I've got that as an 'oid' (object id), created by a 10ms
> delayed, non-repeating (timestamped) ID factory. The system identifier

Check out the JCR spec on this one.  It's a globally unique ID of a
Node. 

> If you're talking about the prototype we've discussed, I mean more
> information about the ability to continue to use non-JSR 170 backends,
> as we may need to. We may have a very strong need to if we end up
> backing the system into a CMS (which I wouldn't particularly like but
> it might not work with our archiving system otherwise, dunno yet).

I think the chances of using a non-JCR backend is essentially zero,
because it would mean duplicating the entire metadata layer and
essentially redesigning JSR-170.

But this is a very long topic and I don't have more time...

/Janne

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