[ietf-dkim] Issue 1576: Revise wildcard discussion

[Wietse Venema]

Frank Ellermann:
> The version in ssp-04 IMO misses the following wildcard TXT points:
> (1) There is no explicitly specified way to identify an ADSP record,
>      when it comes as one of several TXT records in a q=txt reply.
>      In the terminology of an IAB draft ADSP defines no TXT subtype.

Eliot Lear:
> The authors have chosen the DKIM style of using _adsp.domain, which 
> effectively provides for subtyping.  Do you not believe that is 
> sufficient?  I'll argue that the use of _adsp is actually better in that 
> you don't have to parse through a bunch of crap to get to the 
> appropriate record (normally).  You still need the code checks, of course.

This _adsp subtyping does not work with wildcards, unless one has
a DNS server implementation that supports wildcards in the middle
such as _adsp.domainkey.*.example.com.

	Wietse