#NEWLINE# def xid( self , format_id , global_transaction_id , branch_qualifier ) : #NEWLINE# #INDENT# 'Create a Transaction IDs (only global_transaction_id is used in pg)\n        format_id and branch_qualifier are not used in postgres\n        global_transaction_id may be any string identifier supported by postgres\n        returns a tuple (format_id, global_transaction_id, branch_qualifier)' #NEWLINE# return ( format_id , global_transaction_id , branch_qualifier )