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use strict;
use XML::Twig;
...
$twig->parsefile('1.xml');

$twig->print;

<?xml version="1.0"?>
<titles>
...
This is a test
</test>
</titles>

<?xml version="1.0"?>
<titles>
...
        second sub level
        </title></title></name></title>
</titles>

<?xml version="1.0"?>
<titles>
...
        second sub level
        </title></title></name></title>
</titles>