Re: extracting nodes from nodes

Grant McLean schrieb am 09.05.2013 um 15:53 (+1200):
> On Tue, 2013-05-07 at 22:19 +0200, Anne Schumann wrote:
> 
> > using XML::XPATH, I extract rather big modes from a document. After
> > that, is it possible to go on extracting subnodes from these by
> > iterating over every node retrieved from the nodelist?

> With libxml, if you use an XPath expression to find a list of nodes, you
> can use each node as the starting point for another XPath search, e.g.:
> 
>     foreach my $datacenter ( $doc->findnodes('//DataCenter') ) {
> 
>         foreach my $server ( $datacenter->findnodes('.//Server') ) {
> 
>             my $hostname = $server->findvalue('./@hostname');

And this might also be done in just one search:

 //DataCenter//Server/@hostname

And this is still a very simple query example. Most queries you might
want to run can be done in just one query. XPath is a very expressive
query language. Splitting queries up will result in more Perl code.

Michael
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