anchor.diff:  // if statement
   
   ifStatement :
  -	IF condition THEN? (statement+ | NEXT SENTENCE)
  +	IF condition THEN? (statement* | NEXT SENTENCE)
   	(
   		ELSE (statement+ | NEXT SENTENCE)
   	)?
  
positive.code: CLOSE : C L O S E;
  COBOL : C O B O L;
  CODE : C O D E;
  CODE_SET : C O D E MINUSCHAR S E T;
  COLLATING : C O L L A T I N G;
  COLUMN : C O L U M N;
  
negative.code: dataDescriptionEntry :
  	INTEGERLITERAL (dataName | FILLER)? dataDescriptionEntryClause* DOT
  	| LEVEL_NUMBER_66 dataName renamesClause DOT
  	| LEVEL_NUMBER_77 dataDescName dataDescriptionEntryClause* DOT
  	| LEVEL_NUMBER_88 conditionName conditionValueClause DOT
  ;
  
  