Identifier

Identifier is a sequence of any letters and numbers, starting with a letter, which is not a keyword or an operator sign. Identifiers are used to define program variables, constants, types, procedures, functions, the program itself, and so on. When creating identifiers, follow the rules:

An identifier may contain only letters, numbers and underscore characters.
An identifier must start with a letter or an underscore character.
The compiler is not case-sensitive.
The identifier must not exceed 255 characters.

In the BNF language the identifier looks as follows:

$ ident = letter {letter | digit | "_"}.