The childnodes still live in the x: namespace. You have to find them in the same way you find the wrapper, but specify the context node to be $key: 
my $childnodeA = $xpath->findnodes('x:childnodeA', $key);

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In reply to Re: XML::LibXML::XPathContext and Child Nodes by choroba
in thread XML::LibXML::XPathContext and Child Nodes by omegaweaponZ

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