anchor.diff:      : SEQUENCELINE+
       ;
   
  -sequenceline
  -    : SEQUENCELINE
  -    ;
  -
   descriptionline
  -    : DESCLINE
  +    : DESCRIPTIONLINE
       ;
   
   commentline
  
positive.code: grammar fasta;
  
  sequence
      : section+;
  
  section
      : descriptionline 
  
negative.code:     : ';' .*? EOL
      ;
  
  DESCRIPTIONLINE
      : '>' TEXT ('|' TEXT )* EOL
      ;
  
  