Re: [xml] schema validation

["Yong Chen (yongche)" <chen cisco com>]

I just filed Bug #362989 for this, with the schema file as attachment.

I didn't know I could attach a file after pressing "file bug", so I
cut/pasted the schema file in comments too. Please ignore it.

The schema file is the trim-down version (after my a few days try), I
couldn't trim it any more because the problem disappears if I cut the
file size more.

Please let me know if you need any other info.

Thanks,
Yong Chen


> -----Original Message-----
> From: Daniel Veillard [mailto:veillard redhat com] 
> Sent: Friday, October 13, 2006 1:30 AM
> To: Yong Chen (yongche)
> Cc: xml gnome org
> Subject: Re: [xml] schema validation
>
> On Thu, Oct 12, 2006 at 07:19:28PM -0700, Yong Chen (yongche) wrote:
> > Hi Daniel,
> >
> > Sorry to hear that Kasimier lost his job. Hopefully he will 
> get a good 
> > one soon.
> >
> > As for the infinite loop, it happens in both 2.6.22 and 
> 2.6.26. And it 
> > happens in function xmlFAReduceEpsilonTransitions (in xmlregexp.c), 
> > this func calls itself recursively. I noticed it's actually you (not
> > Kasimier) who wrote this file, so I wonder if you can help.
>
>   Okay, I will look.
>
> > I did try to file a bug via bugzilla, but it has a restraint of not 
> > exceeding 64K in comments, but my schema file is 160k.
>
> Try to shorten the schemas to the part which actually raises 
> the problem.
>
> Have you read the XML Schemas specification ? Do you 
> understand how confusing and ambiguous it is ? If not, please 
> read it. I'm serious about this ! Not a book about XSD use 
> case or the doc of the XSD generator you may have used, look 
> at the spec, i.e. what is supposed to guide implementors, you 
> will understand why I'm not thrilled to debug 160 KBytes of this !
>    http://www.w3.org/TR/xmlschema-1/
> When you see experts debating on the meaning of 10 lines 
> schemas and unable to state what is the right behaviour, 
> using 160KB of those for the kind of core infrastructures 
> your company is building is purely scary in my opinion.
>
> Shorten the XSD to the smallest input reproducing the 
> problem. I have little time, if it looks like I will need an 
> hour just to sort out what is actually triggering the problem 
> there is very little chance I will go after it.
> It's not because I have the knowledge of the internals that 
> you should not do your part by trying to reduce to a minimal 
> example reproducing the problem.
>
> > I'll send you the schema file and the code to reproduce it, 
> if you are 
> > interested in it.
>
>  Shorten the inputs, and don't paste data in bugzilla 
> comments but as bugzilla attachments to the bug !
>
>    thanks,
>
> Daniel
>
> --
> Red Hat Virtualization group http://redhat.com/virtualization/
> Daniel Veillard      | virtualization library  http://libvirt.org/
> veillard redhat com  | libxml GNOME XML XSLT toolkit  
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