On Sat, Mar 23, 2013 at 10:50:15AM +0000, Alex Bligh wrote:
> I quite often need to find a set of nodes using an XPath expression, then for
> each node in that set, do something, then search for zero or more children of
> that node.
>
> What I'm interested in is whether the second search can be done with XPath
> too. Can I somehow search for children of a particular node? An obvious
> way would be to use an XPath context based on that node, but you only
> seem to be able to create a context based on a document tree.
>
> Right now, I am manually iterating through children of the node concerned.
> That's fine, but only works well when I'm searching for immediate children,
> and is obviously not as flexible as XPath.
>
> I can't help feeling I'm missing something here.
Yup,
assuming you have a nodeset from the first XPath query,
then create a new XPath context for the document (do not reuse
the old one there) and then for each node in you node set from
the first query do
ctxt->node = node;
res = xmlXPathEval("./foo..", ctxt);
...
of course the subtree query will have to be relative, i.e. not
starting by /
Daniel
--
Daniel Veillard | Open Source and Standards, Red Hat
[email protected] | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | virtualization library http://libvirt.org/
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