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From: "Gustaf Liljegren" <firstname.lastname@example.org>
> I think you definition of the word 'encoding' is a little too broad. This
> is not about encodings. It's about giving users the freedom to choose which
> parts of Unicode they want. How to specify the method to convert character
> numbers to binary form is another problem, and I'm happy with the solution
> XML provides.
One of the little schema languages that ISO DSDL may contain is one for
doing this kind of thing.
The intent, as I understand it, is to handle the real-life production case where
a particular system (in particular, a typesetting system) can handle a known
set of characters only, and the user wants to check the documents for
To give an example of where this may be useful: I know of a CD-ROM hypertext
system which could not display µ without extra work. The document was a
reference book used in potentially life-critical occassions. A check that
all the characters that were used in the document were available would
have saved some last minute kerfuffle when proofreading found the problem
late in the day.