to_string
Description:
Creates a string representation of this, in the format <gtrid>,<bqual>,<formatID> the < gtrid> and <bqual> strings contain alphanumeric characters, and non alphanumeric characters are converted to "%ab" where ab is the hexadecimal representation of the character.
Parameters:
| this | a XaTransactionId pointer | 
Returns:
| a new string representation of this |