floating-point-number	= [ sign ] *DIGIT decimal-point *DIGIT [ exponent ]
			/ [ sign ] 1*DIGIT [ decimal-point *DIGIT ] exponent
sign			= "+" / "-"
decimal-point		= "."
exponent		= exponent-marker [ sign ] 1*DIGIT
exponent-marker		= "e" / "s" / "f" / "d" / "l"
			/ "E" / "S" / "F" / "D" / "L"