XML Payment Format

Hi,

A couple of queries with regards to the XML Format used for making payments.  I am working on a Swedish format with my aim being to select certain values of a bank account number (last five digits), format the number (the first four characters must be '0000') so that it is nine characters long then add a tenth character which will be a space - '000060952  '

I am happy with the formating to work but I am stuggling with selecting the relevant characters from the bank account and adding the space at the end.

First:

Is there a command within XML that will allow the selection of specific characters of a bank account number i.e. the bank account number is nine characters long (015760952) but I only want to select the last five characters (60952).