Re: [xml] Schemas parser error: when using libxml2 to parse the schema of SOAP 1.2

[cazic gmx net]

Hi,

> Von: Daniel Veillard <veillard redhat com>
> Datum: Wed, 20 Jul 2005 08:54:51 -0400
>
> On Wed, Jul 20, 2005 at 06:48:16PM +0800, Gloria Yang wrote:
> > Dear all:
> >
> > I am using libxml2 with the schema of SOAP1.2 to validate SOAP message
> > http://www.w3.org/2002/12/soap-envelope/
> >
> > And I got an error message like:
*****************************************************************************
> > soap2002.xsd:88: element field: Schemas parser error : 
> > Element '{http://www.w3.org/2001/XMLSchema}field', 
> > attribute 'xpath': The XPath expression '@xml:lang' could not be
> compiled.
*****************************************************************************
> > Is there anything wrong?
>
>   Apparently. Potentially libxml2 could not compile your schema, it maybe
> a libxml2 bug.
>
> > What should I do?
>
>   Wait until Kasimier comes back from vacations (3 weeks), or chase the
> problem yourself. In any case a reduced reproductible test case in

:-) Bad weather started punctually one hour before I left work last
week; my vacations are somehow wired directly proportional to cloud
producing phenomenons. So I'm sitting here and trying to learn a bit
about the Debian system (with Martin F. Krafft's book - it's great!).
Daniel, believe it or not, I'm at _home_ and am writing this through
a Gnome desktop :-) Hope to deminish my reputation as a
Linux-dumbass by a couple of percent points; guess I'm at 70% dumbass
level now :-)

> bugzilla
> is the best way to make sure the problem will be looked at (we will not
> guess what is your schemas, what is your instance or go though a huge
> schemas
> to find the actual problem, that is *your* job as a bug reporter).
>    Reading and following http://xmlsoft.org/bugs.html indications is what
> you should do.
>
> > Any suggestion is appreciated.

The bug is in xmlschemas.c, xmlSchemaCheckCSelectorXPath(),
where a list of in-scope namespaces is build; this relies on
xmlGetNsList(), which does not incude the XML namespace, thus
xmlPatterncompile() chokes on the "xml" prefix being not bound to
a namespace. Should we add the XML namespace on
the schema side or change the behaviour of xmlGetNsList() ?

Greetings,

Kasimier