--On Friday, February 15, 2013 14:10 -0800 Joe Touch
<touch(_at_)isi(_dot_)edu> wrote:
Let's just say that there doesn't appear to be disagreement
that the DNS can handle a-z/0-9/'-'.
Other values _may or may not_ be permitted or handled opaquely
in the lookup, AFAICT. It remains a question AFAICT.
Joe,
Except for IDNs (or labels starting with "xn--" more
specifically), for which there are special rules, it appears to
me that the spec is _extremely_ clear that a lookup operation
that fails to deal with those "other values" in labels
--including even properly-escaped embedded "." characters -- is
unambiguously non-conforming.
There should be no "AFACIT" about it, much less a question.
Whether or not it is a good idea to use such labels and in what
contexts is a different matter.
john