Using the module (XML::Twig) really is the easiest way to do it:
use strict;
use warnings;
use XML::Twig;
my $xml = <<XML;
<?xml version="1.0" encoding="UTF-8"?>
<Node_A>
<!-- One Line Comment -->
<Node_B>
<!-- Two Line Comment
Two Line Comment-->
<Node_C>
</Node_C>
<!-- One Line Comment -->
<!-- Multi Line Comment
Line 3Comment
1Line Comment
2Line Comment
Line 5Comment
Line Comment-->
</Node_B>
</Node_A>
XML
my $twig = XML::Twig->new (comments => 'drop', pretty_print => 'indent
+ed');
$twig->parse ($xml);
$twig->print ();
Prints:
<?xml version="1.0" encoding="UTF-8"?>
<Node_A>
<Node_B>
<Node_C></Node_C>
</Node_B>
</Node_A>
Perl is environmentally friendly - it saves trees
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