One example: I can't seem to get dig to work with URI records (but I might be missing some flag). Doing `dig URI _kerberos.hasvickygoneonholiday.com` returns "no servers could be reached" while doing `kdig URI _kerberos.hasvickygoneonholiday.com` returns the proper records.
So seems to be a proper DNS record, but I can't make it work with dig.