Since it is an XML file you can't directly place "&", instead you could use ( & a m p ; ). Please remove the space in between as I can't post the string since it convert that also to just "&". This will work. I have given the reference below for the xml strings for the corresponding special characters for your reference.
& - & a m p ;
< - & l t ;
> - & g t ;
" - & q u o t;
' - & # 3 9 ;
Note: space intentionally added in between for the display.
reference:
http://www.devx.com/tips/Tip/14068[
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Thank You,
Siju Thomas.