[dsdl-discuss] Re: Does Part 7 need built-in definitions for IANA sets?

Martin Bryan wrote:

> We have an application in which the customer requires us to use Baskerville.
> He also requires the use of the Euro sign. The Euro sign does not exist in
> the Baskerville font, so it can only be used within a section of text that
> is flagged as being set in a different font. In normal text the Euro sign
> must report an error. In specific fonts it does not report an error.

I'm not sure whether this requirement should fall under Part 7. If you
know that Euro is the problem wouldn't it be better to fix this problem
during document transformation (by surrounding Euro character with
instruction to change font, or in XSL-FO you can provide list of
fallback fonts and use
font-selection-strategy="character-by-character")? Font handling during
document formatting is so fragile and fuzzy process that it seems to me
almost impossible to think about possible fonts problem in advance and
capture them as some rule that will be part of validation.

But supporting IANA character sets seems more reasonable for me, as on
legacy systems you are very often limited to usage of Unicode subset
defined by some encoding because there are no UTF-8 aware tools.

                                        Jirka

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