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  1. or download this
    #!/usr/bin/env perl
    use strict;
    ...
           <param name="that_setting"></param>
        </params>
    </root>
    
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    Setting already present
    <root>
    ...
        <param name="another_setting">Content here</param>
      </params>
    </root>
    
  3. or download this
    #!/usr/bin/env perl
    use strict;
    ...
    open ( my $output, '>', 'processed.xml' ) or die $!;
    print {$output} $twig -> sprint;
    close ( $output );