Christian,
Without taking a position of the merits on the CA name proposal
(which I am inclined to support but haven't yet thought it through
completely), I am rather strongly oppposed to adding necessary
semantic information through such hacks and conventions as you
propose.
Why is adding a new attribute such a big deal? I expect that
new attributes will be defined and used routinely by the directory
service providers. I think that it is expecting WAY too much
for the X.500 committee to have anticipated every possible use
of this technology and provide all of the attributes in X.520.
I thought the whole reason for using the ASN.1 syntax notation
was to permit adding such features as painlessly as possible??
Bob