Note: PDUTR #25 is a proposed draft Unicode Technical Report at
http://www.unicode.org/unicode/reports/tr25/. The part under
discussion is Section 5.

>That's debatable, and the community around a language called
>"mathematics" is just heading in the exact opposite direction for good
>reasons, 

The community is? Last time I checked, most of the community still
used TeX and the like, and has yet to hear about PDUTR #25 or probably
even Unicode.

>getting 90% of what they need into plaintext, which will
>for the foreseeable future remain the only common denominator data
>format that can transcent individual applications well.

Last time I looked at Mathematica, I could export TeX, but I 
couldn't export a Unicode text file. PDUTR #25 is not supported
by anything yet, and there's no evidence that it's any easier
to export to PDUTR #25 than MathML. PDUTR #25 is almost impossible
to import currently - I don't see why a system that inputs it would
find it much easier to output PDUTR #25 format rather than MathML.

>Otherwise, all markup languages would need the exact same language
>tagging (we had that already with character sets, remember? that's how
>we got to Unicode ...).

How much text will be language tagged, and how much text will be 
mistagged? 98% of tagging is going to be automatic, by the locale,
and some portion of that is going to be wrong, because the author
doesn't care or know enough to fix it. 

>Plaintext remains a far more powerful concept and XML is
>mostly a markup mechanism designed to overcome deficiencies in ASCII
>that appears rather clumsy in a pure Unicode plaintext world.

Show me that Unicode is any less clumsy. For one thing, it requires
massive redesign of the keyboard/input-system to work, it won't display
over archaic terminals and systems, and all the tagging won't work on
any current system.
--
Linux-UTF8:   i18n of Linux on all levels
Archive:      http://mail.nl.linux.org/linux-utf8/

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