Dear PRECIS people,
there seems to be some possible introductions of "sub-profiles" or
"usage-specific alteration to a profile".
It seems to be a generally good way to reduce the numbers of
profiles, but I think we need to clarify some "requirements" for those.
In my opinion, an important role of precis profiles is to
make its operation to be a "brack-box" or "library", so that
proper and non-ambiguous handling of Unicode characters are
being done.
Each profiles will be corresponding to one "function" or "instance"
of a brack-boxed library, like a following:
(pseudo-code only: input is "s")
p = Precis.profilehandler("IdentifierClass")
o = p(s);
if (o == null) raise Error;
return o;
Adding some simple preprocess or postprocess to this template is
easy, as far as the process falls into the following form
o = g(p(f(s)))
with simple pre/postprocesses f and g (without deep Unicode knowledge),
For example, disallowing some ASCII special character such as SP
or COLON is quite easy, and good for being a sub-profile.
However, if the process does not fall into this form,
we need to hack into the implementation of Precis Profiles and
it will not be black-boxed anymore.
For example, "adding an allowed character" falls into this class
and it's impossible (in an straight-forward way) with any f and g.
I feel that such "alterations" must be new profiles, or
there will be a lot of buggy, incompatible implementations around the world.
I also have some concerns on local-mappings: there needs
some reference implementation model for how it will be boxed as a
general library.
Please let me know if you have any opinions or more suggestions.
--
Yutaka OIWA, Ph.D.
Senior Researcher, Research Institute for Secure Systems (RISEC)
National Institute of Advanced Industrial Science and Technology (AIST)
Mail addresses: <[email protected]>, <[email protected]>
OpenPGP: id[440546B5] fp[7C9F 723A 7559 3246 229D 3139 8677 9BD2 4405 46B5]
_______________________________________________
precis mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/precis
