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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"`

  Download entire grammar as text.

Identifiers are unlimited in length. Case is significant.