Re: [xml] Schema validity failure for valid document

[cazic gmx net]

Hi and a happy new year,

> On Mon, Jan 03, 2005 at 08:11:17AM -0500, Scott Lawrence wrote:
> > xerces-c validation routines returned:
> >
> > Error at file
> /home/lawrence/Work/libxml2/build/tmp/call_event_examples.xml, line 18,
char 12
> >   Message: Element 'from' is not valid for content model:
> '((dialog,to),from)'.  
> > The xmllint error:
> >
> > > call_event_examples.xml:3: element call_event: Schemas validity error
> :
> > > Element 'call_event' [CT local]: The element content is not valid.
> >
> > isn't really informative enough (or wasn't for me, at least).

Please have a look at [1] - the element content for <call_event> was
not correct as well in your example instance.

>   well, at the time of the error, all libxml2 had left from the Schemas
> content model is a compiled automata. Sometimes that automata can be
> reserialized as a string making sense to a human, we don't have an API for

This would be great!

> this (yet that could be added). It's also sometime hard to find out what
> exactly generated the error, seems the content model wrong is for an
> element
> starting line 3 but the error shows up line 18.

The example instance was indeed in error before line 18, as described in
[1].

>   Error reporting can certainly be improved, but it's usually not trivial
> to
> provide back the "useful" information.

xmlschemas.c rev. 1.92 does not report "The element content is not valid" 
any more. It explicitely reports an unexpected element + reports 
"Missing child element(s)", if not all expected child elements are found;
but this has the (fixable) limitation described in [1].

[1] http://mail.gnome.org/archives/xml/2005-January/msg00005.html

Greetings,

Kasimier