RE: [xml] Error handling with the XmlReader API

["Stéphane Bidoul" <stephane bidoul softwareag com>]

> > Is such a distinction useful?
>
>    Yes because a validation error is not a fatal error parser error
> and both kind of errors tends to be processed in very different ways.

Ok.

> However it seems to me that the python bindings provide 
> adequate support
> since the type of error/warning is provided (parser vs. validity).

This is true for xmlTextReader where there is one callback
with 4 possible error levels, 
but not for parserCtxt where I made 2 callbacks
(one for errors AND validity errors, and one for warnings
AND validity warnings).
 
> > Should I add the 2 necessary callbacks for the xmlParserCtxt 
> > python bindings?
>
>   No the error level should be sufficient to distinguish the case.
> an unified callback is not a problem, the key is to be able 
> to distinguish
> the level of the error.

Agreed for xmlTextReader. For parserCtxt, I propose to
add 2 more callbacks, unless you prefer one callback with
an error level in that case also.

-sbi