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At 2002-10-16 17:37 -0400, John Cowan wrote:
>Tim Bray scripsit:
>
> > In the general case where you want to wrap up weird bits of binary
> > gibberish to control hardware, why don't you just base64 it and not have
> > to worry about which of them are magic C0 Controls and which aren't...
>
>Well, that's a question. Are the terminal control sequences characters or
>octets? On the face of X3.64 (I forget the ISO number), they are octets,
>but people think of "move up" as ESC [ A, not 1/11 5/11 4/1 (in the
>poor-mans-hex used by the standard).
Are you thinking of ISO-2022? Using escape sequences to fill G0 through G3
with 94, 96, 94*94 and 96*96, and then escape or shifting sequences to
single shift or lock shift G0 through G3 into GL and GR?
When I think of those escape sequences I think of representations of
characters from different character sets being loaded into each of G0
through G3, which means to me it is a character encoding issue addressed in
the XML declaration. Processing applications would see the Unicode
characters after a character decoder figured out from the registered escape
sequences the character sets and corresponding characters in the stream.
I don't think anything need be "solved" at the character level of XML ...
ISO-2022 controls to me are just that ... controls ... not characters.
................. Ken
p.s. Anyone else out there work with NAPLPS X3.110(ANSI)/T500(CSA) that was
based on ISO-2022?
--
G. Ken Holman mailto:gkholman@CraneSoftwrights.com
Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/
Box 266, Kars, Ontario CANADA K0A-2E0 +1(613)489-0999 (F:-0995)
ISBN 0-13-065196-6 Definitive XSLT and XPath
ISBN 0-13-140374-5 Definitive XSL-FO
ISBN 1-894049-08-X Practical Transformation Using XSLT and XPath
ISBN 1-894049-10-1 Practical Formatting Using XSL-FO
Next public training: 2002-12-08,2003-02-03,06,03-03,06
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