how I can view my output file? I don't see any generated output files
You can print directly to a file using the toFile() method. Add the following lines to the example given above: 
$new->addChild($features);
my $filename = 'new.xml';
my $ok = $new->toFile($filename,2);

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I assume "parser" in this case will be parsing the source file (where im getting my input from) right?
Yes, you would set up the parser like this, probably in a loop to go through each file: 
my $file = 'file-1.xml';
my $parser = XML::LibXML->load_xml(location => $file);

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In reply to Re^3: copy XML elements from one file to another by tangent
in thread copy XML elements from one file to another by Anonymous Monk

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