I have several xml files from where I want to read data and put it together in a single xml file. The origin files look all like this like this:

<testsuites>
  <testsuite name="test_suite_name" ...>
    <testcase name="test1" .../>
    <testcase name="test2" .../>
  <testsuite name="some_name" ...>
</testsuites>
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So, basically a single node "testsuite" which contains several "testcases" in each file. So I basically want to extract the "testsuite" node from each file and put it into a new file. I also would like to modify the attribute "name" of each testsuite. So far I have:

my $dom  = XML::LibXML::Document->new('1.0', 'utf-8');
my $xml1 = XML::LibXML->load_xml(location => 'file1.xml');
my $xml2 = XML::LibXML->load_xml(location => 'file2.xml');

my $root = $dom->createElement('testsuites');
$dom->setDocumentElement($root);

my $testsuite1 = $xml1->findnodes('//testsuite');
my $testsuite2 = $xml2->findnodes('//testsuite');

my $child = $dom->createElement($testsuite1); # <-- fails
$root->appendChild($child);

open XML, ">result.xml";
print XML $dom->toString();
close XML;
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$testsuite1 is a XML::LibXML::NodeList object type. Is there a way to use that object to inject it in some way to $doc?