Re: Question regarding XPath

Daniel Veillard [mailto:veillardredhat.com] wrote:
>
> On Fri, Mar 16, 2007 at 09:39:33AM -0700, James Dennett
wrote:
> > Daniel Veillard wrote:
> >
> > > On Fri, Mar 16, 2007 at 09:03:01AM -0500,
Ethan Metsger wrote:
> >
> > [snip]
> >
> > > > shed some light on how xmlXPathEval
differs from
> > xmlXPathEvalExpression,
> > > > and whether the issue is related to the
context passed?
> >
> > This seems to be something of an FAQ around here. 
It would be
useful
> > for the documentation of these functions to
document how they
differ,
> > possibly with a reference to the XPath spec. 
Maybe some kind soul
> > reading this thread can find the time to prepare a
patch.  I don't
have
> > time right now.
> >
> > >   Use xmlXPathEval(), see XPath spec to see
the real difference:
> > >   http://www
.w3.org/TR/xpath#NT-LocationPath
> > >   [1]   	LocationPath
> > >
> > >   http://www.w3.org/
TR/xpath#NT-Expr
> > >   [14]   	Expr
> >
> > So the difference is that xmlXPathEvalExpression
handles an XPath
> > "Expr", whereas xmlXPathEval handles an
XPath "Location Path", which
is
> > a particular kind of Expr.  In other words:
xmlXPathEvalExpression
> > should be able to handle any expression that
xmlXPathEval can, and a
> > number more.
> 
>   Actually no, they both call xmlXPathEvalExpr() and
hence both
evaluate
> based on production 14. As I said there should be no
perceived
differences
> between both call.

OK; that matches your message in the older thread, but in
this thread I
was confused by you writing "see XPath spec to see the
real difference",
if the answer is that there is no difference.  Would you
agree that a
patch to the documentation would be helpful, were someone to
prepare
one?

-- James
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On Fri, Mar 16, 2007 at 11:46:51AM -0700, James Dennett
wrote:
> OK; that matches your message in the older thread, but
in this thread I
> was confused by you writing "see XPath spec to see
the real difference",
> if the answer is that there is no difference.  Would
you agree that a
> patch to the documentation would be helpful, were
someone to prepare
> one?

  Sure I take patches ! 

Daniel

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