Re: [xml] Status of XML Schema validation support of libxml2

[Daniel Veillard <veillard redhat com>]

On Mon, Jun 22, 2009 at 03:39:06PM +0200, D.Hendriks (Dennis) wrote:
> Hello all,
>
> the libxml2 website states: "A partial implementation of XML Schemas  
> Part 1: Structure is being worked on but it would be far too early to  
> make any conformance statement about it at the moment."
>
> It looks like this statement has been there for over 7 years already  
> (http://web.archive.org/web/20020604015853/http://xmlsoft.org/index.html).
>
> I have two (groups of) questions:
>
> 1. Is that statement still relevant? Would it be possible to state what  
> functionality does work? Maybe a subset is known to work? Or would it be  
> possible to state what doesn't work?

  For that one would need someone fully understanding 1/ the XSD part1
specification and 2/ libxml2 schemas code.
  I'm afraid no person on this planet have that knowledge :-(

> 2. Also, if something doesn't work (isn't implemented) and I use it,  
> will there be an error/crash, or will there be a warning, or will it  
> simply skip checking something? Are there false positives/negatives?
>
> Basically, any insight into what is/isn't working and the implications  
> of that, would be greatly appreciated.

  Do you fully understand the XSD part 1 specification ? I don't, I
tried, 7 years ago ... oh ...

  It works well for a number of tests, but there are parts that are not
implemented, or which my not be implemented per the spec. Crash are
unlikely, errors at compile time are possible, and unfortunately false
positive too.

Daniel

-- 
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