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