Re: Xpath not working

Yep, what the other Anon said. Here's the relevant code on how to actually do it:

my $xpc = XML::LibXML::XPathContext->new($doc);
$xpc->registerNs('p', 'http://www.crtp.it');
$xpc->registerNs('p2', 'http://www.crpt.com');
my $finded = $xpc->findnodes("/p2:login/p:utenti[p:email='$email' and 
+p:password='$digestpass']");
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Re^2: Xpath not working by Anonymous Monk on Mar 27, 2014 at 20:50 UTC
To correct my first sentence of the parent and expand the explanation a little: Your line `$doc->documentElement->setNamespace("http://www.crtp.it","p");` does not work, and the documentation of `XML::LibXML::Element->setNamespace` explains why: The function fails if it is required to create a declaration associating the prefix with the namespace URI but the element already carries a declaration with the same prefix but different namespace URI. Which means you can't re-use the "p" prefix as it's already in use on the element; you'd have to pick a different prefix, then the `setNamespace` call would work and you wouldn't need to do `registerNs` on two namespaces. However, you would still need to make one `XML::LibXML::XPathContext->registerNs` set-up as shown in the parent. So TIMTOWTDI; personally I wouldn't manipulate the XML, but adjust my XPath to fit the XML (this is the solution shown in the parent, and you could remove the `setNamespace` call from your code).	[reply] [d/l] [select]

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Re^2: Xpath not working
by Anonymous Monk on Mar 27, 2014 at 20:50 UTC

To correct my first sentence of the parent and expand the explanation a little:

Your line $doc->documentElement->setNamespace("http://www.crtp.it","p"); does not work, and the documentation of XML::LibXML::Element->setNamespace explains why:

The function fails if it is required to create a declaration associating the prefix with the namespace URI but the element already carries a declaration with the same prefix but different namespace URI.

Which means you can't re-use the "p" prefix as it's already in use on the element; you'd have to pick a different prefix, then the setNamespace call would work and you wouldn't need to do registerNs on two namespaces.

However, you would still need to make one XML::LibXML::XPathContext->registerNs set-up as shown in the parent.

So TIMTOWTDI; personally I wouldn't manipulate the XML, but adjust my XPath to fit the XML (this is the solution shown in the parent, and you could remove the setNamespace call from your code).

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