Expression Syntax

This is just an area win which I'm exploring a simple expression syntax ...

operators := ( "+" | "-" | "*" | "/" | "%" );
expression := 
  ( identifier 
  | operator /* monadic */ expression 
      ( operator /* diadic */ expression )
  | "(" expression ")"
  );

The above syntax should let you have any operator as either monadic or diadic ... and has no implicit precedence (ie the brackets are required to produce the precedence)