anchor.diff:  THAN : T H A N;
   THEN : T H E N;
   THREAD : T H R E A D;
  +THREAD_LOCAL : T H R E A D MINUSCHAR L O C A L;
   THROUGH : T H R O U G H;
   THRU : T H R U;
   TIME : T I M E;
  
positive.code: TRUE : T R U E;
  TRUNCATED : T R U N C A T E D;
  TYPE : T Y P E;
  UNIT : U N I T;
  UNLOCK : U N L O C K;
  UNLOCKFILE : U N L O C K F I L E;
  
negative.code: dataDescriptionEntryFormat1 :
  	(INTEGERLITERAL | LEVEL_NUMBER_77)
  	(dataName | FILLER)?
  	dataRedefinesClause?
  	dataExternalClause?
  	dataGlobalClause?
  	dataTypeDefClause?
  	dataThreadLocalClause?
  	(
  		dataPictureClause
  		| dataValueClause
  