Looking for docs on "A" RR duality of functions

[octalnanog at alvarezp.org (Octavio Alvarez)]

Hi.

Do you know if there are any docs (RFC, drafts, independent...) that
study the tricks being done with the A/AAAA RRs? What I mean is that it
is currently being used not only to resolve the IP address of a
hostname, but for load-balancing as well, the case being that the
hostname is not just a "host"-name anymore, but a "service"-name (?) so
to speak.

I'd like to know if somebody else has gone deeper into this and if there
are related documents on the matter.

Thanks.