It appears that Paul Wouters  <p...@nohats.ca> said:
>> Section 4.1.2. says:
>>           | URI        | _dccp                 | [RFC7566]     |

>I think this might have been part of a list used to "reserve" the names
>of (transport) protocols, so that constructs like _25._quic.example.com
>could be constructed where the _name denotes the protocol and not the
>name of something. I think dccp got added to this list because it is
>references as a "transport protocol" in RFC4340 and the author wanted
>to make sure transport protocol names were not accidentally squatted
>by newly invented things with a clashing name/acronym.

I think I'm the one who added it and that was definitely the idea. You
should be able to use SRV or URI with any transport protocol so in
view of the modest set of transport protocols in use, we might as well
reserve their names. Dunno where that RFC number came from, though.

R's,
John

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