my $xml = new XML::Simple (Outputfile => $conf,
                           RootName=>'exec');
$exec = {
     'tc' => [
          {
            'id' => '001.001'
          },
          {
            'id' => '002.001'
          },
          {
            'id' => '003.001'
          },
      ]
 };

$data = $xml->XMLout($exec);
print Dumper($data);
}