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> The most obvious alternative would have been to require all callbacks
> to return a boolean value, which would be a giant programming pain for
> the majority of applications that process the complete XML document.
I am not sure how easy this is in Java, but in Delphi/C++ one would
use a var parameter, pre-set to the most likely value, so that
in the normal case the programmer would not do anything about it.
In Java you might use a status object, whose state is preset?
> We could also have set up a method on the parser itself, but in Java
> that is much more kludgey than using an exception.
In Expat (SAX-like, but not SAX) we are going to add a status to the
callback signatures. This is for the purpose of adding a Pull API,
while still keeping the Push API. In Pull mode the callbacks will act
as "filters" (status = Continue, Stop, Error, ...), in Push mode one
can use them directly.