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2.3 Identifiers and keywords

Identifiers (also referred to as names) are described by the following lexical definitions:

      identifier:     (letter|"_") (letter|digit|"_")*
      letter:         lowercase | uppercase
      lowercase:      "a"..."z"
      uppercase:      "A"..."Z"
      digit:          "0"..."9"

Identifiers are unlimited in length. Case is significant.

- 2.3.1 Keywords
- 2.3.2 Reserved classes of identifiers