3.1.3 EBNF-Syntax


Spaces are allowed (except inside of qualifiers/names) in the whole
functiontext and may be used to structure the term.

  Function   = Qualifier [ "(" [ Qualifier { "," Qualifier } ] ")" ]
               "=" Expression .

  Expression = Prio1 [ ( "=" | ">" | "<" | "<=" | ">=" | "<>" )
               Expression ] .

  Prio1      = [ "+" | "-" ] Prio2 [ ( "+" | "-" | "OR" ) Prio1 ] .

  Prio2      = Prio3 [ ( "/" | "*" | "AND" ) Prio2 ] .

  Prio3      = [ "NOT" ] Prio4 [ "^" Prio3 ] .

  Prio4      = Number | "(" Expression ")" | Qualifier | Call .

  Call       = Qualifier [ "(" Expression { "," Expression } ")" ] .


  Number     = Figure { Figure } [ "." Figure { Figure } ]
               [ "E" ["-"] Figure { Figure } ] .

  Qualifier  = Letter { Letter | Figure } .

  Figure     = "0" | .. | "9" .

  Letter     = "A" | .. | "Z" | "a" | .. | "z" | "'".