use Utils::XMLUtils qw(loadXMLFile
                       getNodesFromPath
                       getNodeFromPath
                       getChildren
                       getNodeName
                       getValueFromPath
                       getValuesFromPath
                       checkIfExists
                       createXMLDocument
                       createNewElement
                       assignChild
                       createTextElement
                       wrtiteTofile
                      );
use Digest::SHA1 qw(sha1);


sub getHexData {
    my ($key)= unpack("H*",shift);
    return $key; 
}

print "Enter the file path :";
my $file = <STDIN>;
chomp($file);
print "Enter chunk size :";
my $size = <STDIN>;
chomp($size);

open(FILE, $file) || die "Unable to open the file";
my $doc = createXMLDocument();
my $SigData = createNewElement($doc, "SigData");
$len = read(FILE, $data, $size);
while ( $len != 0) {
  $datalen = $size == $len ? $size: $len;
  $digest = sha1($data);
  $keydata = getHexData($digest);
  $data = getHexData($data);
  $kvpair = createNewElement($doc, "KVPair");
  $key = createNewElement($doc, "Key");
  $keytext = createTextElement($doc, $keydata);
  assignChild($key, $keytext);
  $Value = createNewElement($doc, "Value");
  $Valuetext = createTextElement($doc, $data);
  assignChild($Value, $Valuetext);
  assignChild($kvpair, $key);
  assignChild($kvpair, $Value);
  assignChild($SigData, $kvpair);

  $len = read(FILE, $data, $size);

}
wrtiteTofile($SigData,"sample.xml",0);
close(FILE);
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I have a Programme above like this, which will take a file and create keys and values and append to a XML File.
I have written functions for all this XML utilities.
LoadXMLFile,getNodesFromPath,getNodeFromPath
,getChildren
getNodeName,getValueFromPath,getValuesFromPath,checkIfExists createXMLDocument,createNewElement,assignChild,createTextElement wrtiteTofile

while i try to do for big files (more than 1gb), Big XML is being created as expected. But the problem is to process this huge XML data, into some other programme it is taking much longer time. So i am looking to append the generated key and values to a flat text file. How can i do this. Please help.

a Big Thanks in advance.