Identifiers

Syntax

Identifier = IdentifierHead IdentifierTail.
IdentifierHead = CapitalLetter | "_" .
IdentifierTail = { Letter | Digit | "_"  }.

Letter = CapitalLetter | SmallLetter.

CapitalLetter = 
     "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" |
     "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" |
     "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z".

SmallLetter = 
     "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" |
     "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" |
     "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z".

Purpose

Identifiers are used as symbolic names and as representations of word symbols.