Thanks Ken. I will look in detailed documentation on this. Also, I agree with your point on and the same i also mentioned that it is expected. My point is If i have multiple combinations of root, table, NEW2 isn't that every time the loop runs it overwrites the old value because we are storing $key for  $xml_data->{$root}{$table}{NEW2}{KEY} So to avoid that, i used $xml_data->{$root}{$table}{NEW2}{$key} = [$key]; but it resulted into 
 <ABC>ABC</ABC>
<DEF>DEF</DEF>

[download]
, without this it displays only the last row with that combination in the file <KEY>DEF</KEY>

In reply to Re^6: XML File Creation in Perl by documents9900
in thread XML File Creation in Perl by documents9900

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