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$VAR1 = {
          'version' => '2.0',
          'xmlns:media' => 'http://search.yahoo.com/mrss/',
...
                       'zoneColor' => '0'
                     }
        };

my $showAbbreviation = $current->{'fileSet'}->{'showAbbreviation'};
 if ( not defined $showAbbreviation ) {
        $showAbbreviation = "";
    }

if (exists $current->{'fileSet'}->{'showAbbreviation'} ) {
    $showAbbreviation = $current->{'fileSet'}->{'showAbbreviation'};
    print "Yes: $showAbbreviation\n";
...
    $showAbbreviation = "";
    print "No: $showAbbreviation\n";
    }