Extension for Identifer Formats

[neilsjefferies]

An extension, much like the digests one, that lists common identifier formats and how they are stripped for use in storage path generation (RegEx?).

This could also provide mappings from variable length or non-uniformly distributed identifiers to a form better suited for path generation - for example, by using digests/bit scrambling. Or maybe that another extension in its own right.

[awoods]

I can see value in Fedora creating a specification for its identifier formats in this context.

[zimeon]

I agree that a how-Fedora-does-it extension/specification would be useful because Fedora is a major repository in this space. I'm am hesitant about creating something more general unless we hope to encourage some common good approach or discourage some problematic approaches