First, when creating the URI RR I felt a registry WAS needed. The mess with SRV 
could not be accepted.

RFC 6335 cleaned up the SRV mess pretty completely.

1. Merge of all sources we have, i.e. what will the initial list of prefixes 
look like?
2. When adding things to this table, what is really required?

For URI, the prefixes are all of the enumservices, plus the four SRV protocols _udp _tcp _sctp _dccp. The umpteen thousand service names only appear as sub-names of the four protocols so they don't matter here.

One possibility would be to add four dummy entries to the enumservices table to reserve the protocol names, although I think Dave has reasonable concerns about how you make sure to add another entry when someone defines another service in 2027.

For Dave's registry, I think it's adequate to point to the enumservices registry, and do something about the four SRV protocols, perhaps set up a registry for those, or have an entry type field in Dave's registry.

I haven't thought too hard about conflicts with names for other stuff, such as the TXT records with _domainkeys and _dmarc prefixes. I think they don't matter since the RR types are different, but there could be interactions I haven't considered yet.

Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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