anchor.diff:  dataUsageClause :
   	(USAGE IS?)?
   	(
  -		BINARY
  +		BINARY (TRUNCATED | EXTENDED)?
   		| COMP
   		| COMP_1
   		| COMP_2
  
positive.code: EXCLUSIVE : E X C L U S I V E;
  EXIT : E X I T;
  EXTEND : E X T E N D;
  EXTERNAL : E X T E R N A L;
  FALSE : F A L S E;
  FD : F D;
  
negative.code: ;
  
  dataValueClause :
  	(VALUE IS? | VALUES ARE?)?
  	(
  		(literal | cobolWord)
  		(
  