anchor.diff:  
   columnOrSuperColumn: StringLiteral;
   
  -host: id+=HostIdentifier -> ^(NODE_ID_LIST $id+);
  -
  -ip: id+=IntegerLiteral id+=DOT id+=IntegerLiteral id+=DOT id+=IntegerLiteral id+=DOT id+=IntegerLiteral -> ^(NODE_ID_LIST $id+);
  +host: id+=Identifier (id+=DOT id+=Identifier)* -> ^(NODE_ID_LIST $id+);
  +
  +ipaddr: id+=IntegerLiteral id+=DOT id+=IntegerLiteral id+=DOT id+=IntegerLiteral id+=DOT id+=IntegerLiteral -> ^(NODE_ID_LIST $id+);
   
   port: IntegerLiteral;
   
  
positive.code:     '\'' (~'\'')* '\'' ( '\'' (~'\'')* '\'' )* 
      ;
  
  IntegerLiteral
     : Digit+;
  
  
  HostIdentifier
      : ( Letter | Digit ) ( Letter | Digit | DOT | '-' )* ( Letter | Digit )
      ;
  
  //
  // syntactic elements
  
negative.code: 
  connectStmt
      : K_CONNECT host SLASH port -> ^(NODE_CONNECT host port)
      | K_CONNECT ipaddr SLASH port -> ^(NODE_CONNECT ipaddr port)
      ;
  
  helpStmt
  