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<parent_node xmlns="my_context">
<wrapper att1="abc">
...
<childnodeA>stuff2</childnodeA>
</wrapper>
</parent_node>

$xpath = XML::LibXML::XPathContext->new($xml->documentElement);
...
        $att1 = $key->getAttribute('att1');
        $childnodeA = $key->findnodes('./childnodeA'); 
    }