anchor.diff:  KEPT : K E P T;
   KEY : K E Y;
   LABEL : L A B E L;
  +LANGUAGE : L A N G U A G E;
   LAST : L A S T;
   LEADING : L E A D I N G;
   LEFT : L E F T;
  
positive.code: CONTROL : C O N T R O L;
  CONTROL_POINT : C O N T R O L MINUSCHAR P O I N T;
  CONTROLS : C O N T R O L S;
  CONVERTING : C O N V E R T I N G;
  COPY : C O P Y;
  CORR : C O R R;
  
negative.code: 	(INTEGERLITERAL | LEVEL_NUMBER_77)
  	(dataName | FILLER)?
  	dataRedefinesClause?
  	dataIntegerStringClause?
  	dataExternalClause?
  	dataGlobalClause?
  	dataTypeDefClause?
  	dataThreadLocalClause?
  	(
  		dataPictureClause
  		| dataCommonOwnLocalClause
  		| dataTypeClause
  		| dataUsingClause
  		| dataValueClause
  		| dataUsageClause
  		| dataOccursClause
  