Syntaxdiagramme

Beispiel:

  syntax     = [ title ] "{" { rule } "}" [ comment ].
  rule       = identifier "=" expression ( "." | ";" ) .
  expression = term { "|" term } .
  term       = factor { factor } .
  factor     = identifier
             | literal
             | "[" expression "]"
             | "(" expression ")"
             | "{" expression "}" .
  identifier = character { character } .
  title      = literal .
  comment    = literal .
  literal    = "'" character { character } "'"
             | '"' character { character } '"' .