// do line comments work?

Root ::= A* B*;
A ::= <Name> /SomeNTA:A/;
B ::= <Name>;

rel A.Di1  -> B;
rel A.Di2? -> B;
rel A.Di3* -> B;

/*
  do multiline comments work
*/

/**/

/*
 * work?
*/

/**
 * The root of a Java AST.
 *
 * <p>A Java program consists of multiple compilation units that represent the
 * source files of the program.
 */

rel A.Bi1 <-> B.Bi1;
rel A.Bi2 <-> B.Bi2?;
rel A.Bi3 <-> B.Bi3*;

rel A.Bi4? <-> B.Bi4;
rel A.Bi5? <-> B.Bi5?;
rel A.Bi6? <-> B.Bi6*;

rel A.Bi7* <-> B.Bi7;
rel A.Bi8* <-> B.Bi8?;
rel A.Bi9* <-> B.Bi9*;

rel A <- Root.AaLeft?;
rel B <- A.Di1Left ;
rel B <- A.Di2Left?;
rel B <- A.Di3Left*;

// empty productions
C ;

// production with nonterminals of different kinds
D ::= SingleA:A ListOfA:A* [OptionalA:A] /NTAA:A/ ;

// production with tokens, nonterminal-tokens, multi-line
E ::= <T1> <T2:String> <T3:boolean> <T4:int> <T5:float> <T6:double> <T7:long>
      /<NT2:String>/ /<NT3:boolean>/ /<NT4:int>/ /<NT5:float>/ /<NT6:double>/ /<NT7:long>/ ;

// inheritance and empty
F : A ;

// inheritance and more on RHS
G : C ::= [D] ;

// line comment with special symbols like |, *, ->, <-, <->, [A], B ::= C, :, \n, \r, ~, #, /A/
/* block comment with special symbols like |, *, ->, <-, <->, [A], B ::= C, :, \n, \r, ~, #, /A/ */