anchor.diff:  NATIONAL : N A T I O N A L;
   NATIVE : N A T I V E;
   NEGATIVE : N E G A T I V E;
  +NETWORK : N E T W O R K;
   NEXT : N E X T;
   NO : N O;
   NOSEQ : N O S E Q;
  
positive.code: otherKeyword :
  	ACCEPT | ACCESS | ADD | ADDRESS | ADVANCING | AFTER | ALIGNED | ALL | ALPHABET | ALPHABETIC | ALPHABETIC_LOWER | ALPHABETIC_UPPER | ALPHANUMERIC | ALPHANUMERIC_EDITED | ALSO | ALTER | ALTERNATE | ANY | APOST | APPROXIMATE | ARE | AREA | AREAS | ARITH | AS | ASCENDING | ASCII | ASSIGN | AT | ATTRIBUTE
  	| BEFORE | BEGINNING | BINARY | BIT | BLANK | BLOCK | BOTTOM | BOUNDS | BY | BYFUNCTION | BYTITLE
  	| CALL | CANCEL | CD | CF | CH | CHANNEL | CHARACTER | CHARACTERS | CLASS | CLOCK_UNITS | CLOSE | COBOL | CODE | CODEPAGE | CODE_SET | COLLATING | COLUMN | COMMA | COMMITMENT | COMMON | COMP | COMP_1 | COMP_2 | COMP_3 | COMP_4 | COMP_5 | COMPUTATIONAL | COMPUTATIONAL_1 | COMPUTATIONAL_2 | COMPUTATIONAL_3 | COMPUTATIONAL_4 | COMPUTATIONAL_5 | COMPUTE | CONTAINS | CONTENT | CONTINUE | CONTROL | CONTROL_POINT | CONTROLS | CONVENTION | CONVERTING | COPY | CORR | CORRESPONDING | COUNT | CURRENCY | CURSOR
  	| DBCS | DE | DEBUG_CONTENTS | DEBUG_LINE | DEBUG_NAME | DEBUG_SUB_1 | DEBUG_SUB_2 | DEBUG_SUB_3 | DEBUGGING | DECIMAL_POINT | DECLARATIVES | DEFINITION | DELETE | DELIMITED | DELIMITER | DEPENDING | DESCENDING | DESTINATION | DETAIL | DFHRESP | DFHVALUE | DISABLE | DISK | DISPLAY | DISPLAY_1 | DIVIDE | DIVISION | DONTCARE | DOUBLE | DOWN | DUPLICATES | DYNAMIC
  	| EBCDIC | EGCS | EGI | ELSE | EMI | ENABLE | END | END_ADD | END_CALL | END_COMPUTE | END_DELETE | END_DIVIDE | END_EVALUATE | END_IF | END_MULTIPLY | END_OF_PAGE | END_PERFORM | END_READ | END_RECEIVE | END_RETURN | END_REWRITE | END_SEARCH | END_START | END_STRING | END_SUBTRACT | END_UNSTRING | END_WRITE | ENDING | ENTER | ENTRY | ENTRY_PROCEDURE | EOP | EQUAL | ERROR | ESI | EVALUATE | EVENT | EVERY | EXCEPTION | EXCLUSIVE | EXIT | EXPORT | EXTEND | EXTENDED | EXTERNAL
  	| FALSE | FD | FILLER | FINAL | FIRST | FOOTING | FOR | FROM | FULL | FUNCTION | FUNCTIONNAME | FUNCTION_POINTER
  	| GENERATE | GOBACK | GENERIC | GIVING | GLOBAL | GO | GREATER | GROUP
  
negative.code: 	| decimalPointClause
  	| symbolicCharactersClause
  	| environmentSwitchNameClause
  	| defaultDisplaySignClause
  	| defaultComputationalSignClause
  	| reserveNetworkClause
  ;
  
  alphabetClause :
  	alphabetClauseFormat1
  	| alphabetClauseFormat2
  ;
  
  alphabetClauseFormat1 :
  	ALPHABET alphabetName (FOR ALPHANUMERIC)? IS?
  	(
  		EBCDIC
  