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.
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.
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