Literals meaning
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To allow the producer to explicitly declare his/her intentions, two literals are reserved: ' all ', ' none ' .
You may wonder why you would ever use the element element if you can use literals.
numeric literals containing a decimal point or an exponent sign yield floating point numbers.
integer literals in the source code are by default treated as int values, which are suitable for use with all integer types.
The type of string literals is array of char.