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> A parser designed for XML 1.0 will do one of several things:
Your list was incomplete. For example, there are at least "give a warning
and proceed" and "report a validity error and proceeed" options. I'd suggest
either of those could be appropriate transition strategies.
> The preferred response is that it should stop at the XML declaration and
> say, "I don't know how to handle this."
"Fatal error" option.
> A less desirable response would be to ignore the declaration and proceed.
"ignore" option ... seems unwise to me, users will be mystified when
a blueberry-related error ("blueberror"? :) breaks something later.
> The least desirable response would be that the parser would only reject text
> known to be necessarily illegal in the combination of XML 1.0/UNICODE 2.0.
That seems to be a core conformance requirement for a parser that's
claiming to conform to the XML 1.0 specification; a parser that doesn't
do that has a bug.
- Dave
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