The value space shall have a lexical representation consisting of a base 10 mantissa followed, optionally, by the character "E" or "e", followed by a base 10 exponent. The exponent shall be an integer. The mantissa shall be a decimal number. The representations for exponent and mantissa shall follow the lexical rules for integer and decimal below. If the "E" or "e" and the following exponent are omitted, an exponent value of 0 is assumed.

Lexical representations for zero can take a positive or negative sign.

[Example: -1E4, 1267.43233E12, 12.78e-2, 12 , -0, and 0 are all valid literals for numbers in the default value space. 4503599627370497.5 is also a valid literal, although it represents the same value as 4503599627370497 (2^52 + 1) in the default value space (as explained in §3.17.5.4). end example]

An Integer has a lexical representation consisting of a finite-length sequence of decimal digits (#x30–#x39) with an optional leading sign. If the sign is omitted, "+" is assumed. [Example: -1, 0, 12678967543233, +100000. end example]

A Decimal Number has a lexical representation consisting of a finite-length sequence of decimal digits (#x30–#x39) separated by a period as a decimal indicator. An optional leading sign is allowed. If the sign is omitted, "+" is assumed. Leading and trailing zeroes are optional. If the fractional part is zero, the period and following zero(s) can be omitted. [Example: -1.23, 12678967.543233, +100000.00, 210. end example]