Re: [xml] Will xmllint use schematron?

[Daniel Veillard <veillard redhat com>]

On Wed, May 11, 2005 at 11:11:07AM +0100, Steve Little wrote:
> >   I read http://www.schematron.com/iso/ quickly. I didn't understand it.
> 
> It's not a very good site, IMHO. However, schematron itself is quite a
> neat idea.

  When thinking about implementing something I read the spec. I didn't 
understood that one on the first pass though.

> > It seems it would require XSLT and EXSLT so it would not be implementable
> > at the libxml2 level since XSLT and EXSLT are provided in libraries separate
> > from libxml2.
> 
> I believe that only XPath is required, so it would be possible, but I
> agree with Daniel that it would be better implemented as a seperate tool
> on top of libxml/libxslt.

  Well if it really don't requires xslt/exslt then that would be doable.

> The implementation is fairly trivial, and there are existing
> implementations in XSLT:

It looks simple, problably the reason why I didn't understood the spec :-)

> http://xml.ascc.net/schematron/1.5/
> 
> I've used some of the sample metastylesheets with xsltproc, and have had
> no problems. If you really want a programatic interface, here's a simple
> start point...
[...]
> You could make a metastylesheet makes it trivial to analyse the output for
> problems.

  if it really requires only XPath then a C implementation with full
report would probably be less than 500 lines based on existing libxml2
stuff.

> Alternatively, you can parse the schematron schemafile yourself,
> implement each tag, check the XPaths etc, and thus make a libxml only
> version. Arguably that's a waste of time though, when there's a Free XSLT
> implementation.

  did it really got the ISO standard stamp yet ? If it's short, blessed
by ISO, sensible and amount to less than 1000 lines of C and 20KB of code
I wouldn't mind getting it added to libxml2.

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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