def xpath_lower_case(arg):
 return ("translate(%s, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" % arg)

def xpath_lower_case ( arg ) : return ( "translate(%s, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" % arg )
an ascii lowercase function for xpath .