1  (1)  # (2)  pragma (3)  comment (4)  ( (5) 
2! compiler
2 date
2 timestamp
2.0 copyright
2.0 user
2.1 (6) 

2.1? , (7)  " token_sequence " (8) 
2.1.1 ) (9) 
2.1.2 (10)