At 2010-12-29 14:39 +0000, Dave Pawson wrote:
On Wed, 29 Dec 2010 13:14:15 +0000
David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> 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?
But it isn't helpful because the zero match is ambiguously either the
result of a typo in the stylesheet or the absence of an acceptable
item in the source. The processor is obliged to assume the latter
and so cannot assume the former.
I hope this helps.
. . . . . . . . . . Ken
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