Linda,

As a non-vendor, I have been unclear as to:
1. what is the "correct" way to respond to an RFC  - is there a protocol?

I have been wondering this myself for a while now. I generally just comment via IRC, since I never know what else to do. That's definitely *not* the best way to do things, though.
 
2. where is the "correct" place to respond - on the list or on the wiki or where?

See above.
 
3. to whom do I respond? The community at large or the the vendor responsible for the RFC?

Errr... see above again.
 
4. Ok, this is a weird one, I'll admit, but I've wondered at times whether my response would be welcomed or is this a "vendors-only" issue?

Speaking for myself as a semi-vendor, I would welcome any and all comments, *particularly* those from non-vendor-type people, on my RFCs.

Regards,
Jared

--
Jared Camins-Esakov
Freelance bibliographer, C & P Bibliography Services, LLC
(phone) +1 (917) 727-3445
(e-mail) jcamins@cpbibliography.com
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