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<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  [more gorp] >

my $xpc = XML::LibXML::XPathContext->new($dom);
...
else {
    print "did not find graph node edgedefault value\n";
}

my $weightXPATH = ".//gml:data[\@key=\"$weightKey\"]";

if (my $dataWeightNode = @{$xpc->findnodes($weightXPATH,$edgeElement)}
+[0]) {
    $weight = $dataWeightNode->textContent();
}