[urn] Re: URN Namespace Registration for SAID (Self-Addres sing Identifiers)

> 
> Note that as the ABNF is written, an SAID URN must start with one of
> exactly nine prefixes:  E, F, G, H, I, 0D, 0E, 0F, 0G.  You comment that
> it would be useful to allow extensibility.  As the ABNF is stated,
> allowing other prefixes would require an amendment to the registration.
> And clearly, adding a digest algorithm that has a different length
> output would require revising the ABNF.  An alternative would be for the
> registration to say that an SAID URN must start with a prefix listed in
> Table [whatever] of the CESR specification and that it contains as many
> base64urlsafe characters as needed to encode the algorithm's output.
> 

As you all may recall, we had a discussion about this, and it was suggested that we not reference the CESR table but keep things simpler by simply refering to the existing hashes (digests) in the CESR table.  Clearly, the reviewer wants to future-proof the URN by accounting for the source authority, which is the CESR table.

So I agree we should change it to be any Digest algorithm code specified in the latest version CESR master table for Genus 'AAA' And then list as an informative example the current algorithm prefixes.

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