Juliusz Chroboczek wrote on 2002-03-19 16:06 UTC:
> OTOH, XFree86 is already incompatible with the SI for bitmap fonts.

I am being told that the next SI will be fully XFree86 compatible in
that respect.

http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html

Please follow Adobe's character name <-> Unicode mapping strictly.
Please do not add any backwards compatibility hacks for curly 0x27 that
will cause incompatibility with the corrected next generation SI fonts.
This would just prolong the incompatibility and pain this area further.
We now have clear and unambiguous standards in that question, so please
let's follow them.

[The only 8-bit encoding I know of that explicitely has a curly closing
quotation mark on position 0x27 is Adobe's standard PostScript encoding,
which is usually not used in XLFDs.]

> There is no reason why 0x27 in ISO 8859-1 must coincide
> with U+0027 in ISO 10646.

Yes, there definitely is. The second edition of ISO 8859-1 explicitly
declares that its 0x27 and U+0027 are exactly the same thing. ISO 8859
is now defined as the encoding of a UCS subset. And so are the new BDF
fonts. Perfectly consistent in any way.

By the way, I have recently learned that historically, the originally
proposed use of 0x60 in the international 7-bit coded character set was
indeed as a grave accent (ISO TC 97/SC 2 meeting, October 29-31, 1963),
and only later its meaning was extended in the US implementation of the
standard to also cover the use as a left single quotation mark (CACM
8(4)207-214, 1965). So the practice that UCS and Unicode followed was
indeed what the original 1963 ISO 646 drafts said, and the entire curly
quotation mark business in 0x27 and 0x60 is a later national deviation
from the international standard by ANSI. Historic references:

  http://www.cs.tut.fi/~jkorpela/latin1/ascii-hist.html#60

Markus

-- 
Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
Email: mkuhn at acm.org,  WWW: <http://www.cl.cam.ac.uk/~mgk25/>

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