Re: [xml] XPath Location Paths

["Cyberthymia" <cyberthymia yahoo co uk>]

From: "Daniel Veillard" <veillard redhat com>
> On Fri, Apr 12, 2002 at 03:14:50PM +0100, Richard Jinks wrote:
> > If I understand the spec correctly, I'd think that as el1 is the root
node,
> > "name(el1)" should return "el1" and "name(el2)" should return an empty
> > string, i.e. it assumes that the context node is the first child of the
root
> > node, and not the root node itself.
> >
> > I've tested this with a fresh install of libxml2.2-4-19 just to make
sure
> > that none of my previous dips into the XPath source code have messed
> > anything up.
>
>   The problem is as you noted how the current node is being initialized.
> XPath was not designed to be used in isolation, and does not say anything
> about this. Solution: initialize the context node if you want to use
> the XPath primitives directly.

Thanks.
Just had a quick look at the testXPath code to see what it does do with the
context node, and I found this:

in testXPath.c
testXPath() {
xmlXPathContextPtr ctxt;
...
  ctxt->node = xmlDocGetRootElement(document);
...
}

Shouldn't this initialise the context node to be the root node?

I've just confirmed to myself that libxsl (xsltproc) does return the correct
results
if you specify the context to be "/". So the question is, how does libxsl
set the context
to the root node if it doesn't use the method testXPath does?

Thanks,
Richard


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