UPDATE: This has been resolved. Thanks @choroba

I have an issue when trying to parse out child nodes from an XML using XPath Context. I can get attributes fine but it seems to have issues drilling down to grab the child nodes. Can someone explain why? Here's an example:
XML:

<parent_node xmlns="my_context">
<wrapper att1="abc">
<childnodeA>stuff</childnodeA>
</wrapper>
<wrapper att1="abcd">
<childnodeA>stuff2</childnodeA>
</wrapper>
</parent_node>
[download]

Code:

$xpath = XML::LibXML::XPathContext->new($xml->documentElement);
$xpath->registerNs('x', 'my_context');

    foreach $key($xpath->findnodes('x:wrapper'))
    { 
        $att1 = $key->getAttribute('att1');
        $childnodeA = $key->findnodes('./childnodeA'); 
    }
[download]