By using RML barcode tag i am able to print QR (2d) barcode in pdf report.My problem is if the barcode has to store huge amount of data like 1500++ characters i need to increase the barcode size. So please anyone let me know what are the attributes i need to provide for rml tag to increase its size from default one.Below are the things which i tried :

<barCode code="qrcode"  xdim="40mm" ratio="2.2">
             [[ loading dynamic data here with only 50 characters ]]
</barCode>  
<barCode code="qrcode"  xdim="40mm" ratio="2.2">
        [[ loading dynamic data here with 1500 characters ]]
</barCode>  
<barCode code="qrcode"  xdim="80mm" ratio="5.2">
        [[ loading dynamic data here with 1500 characters ]]
 </barCode>

The above all three statements prints the same size(width&height) of barcode in the pdf report.