On Wed, 29 Dec 2010 13:14:15 +0000
David Carlisle <davidc@xxxxxxxxx> wrote:

> On 29/12/2010 13:09, Piet van Oostrum wrote:
> > It would be nice if processors would have a debug mode in which
> > XPath expressions would be checked against a schema or DTD and give
> > a warning when some 'impossible' expression is encountered.
> > Impossible meaning something that never can give a non-empty result
> > on valid documents. Probably just paths that are illegal according
> > to the schema.
> 
> 
> That's exactly what a schema aware xpath2 processor will do.
> 
> David

Even without schema awareness/context, surely the processor can
tell when an xpath expression will result in zero match?




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regards 

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk