220  Appendix D  220  221  222  223 Identifier  224 Directive  225 Label  226 UnsignedInteger  227 UnsignedReal  228  229 ScaleF actor  230 Sign  231 CharacterString  232 DigitSequence  233  234 Letter  235  236  237  238 Digit  239  240 StringElement  Lettel  I  Letter  I  Digit  I  Leffci  {Letter  I  Digit  Digit.' ,'4I1cnce  .  =  Digit.'  (illence  .  Digit.'quence  "."  DigitSequence  ["e"  Scale  I  ill  '(or  1 I  DigitSequence  "e"  ScaleFactor.  =  [Sign IlJigitSequence.  "+"  I "-".  "I"  SI"ingElement  {  StringElement  J  "I"  Digit  I  Digit  J  •  "  "  'b"  "  "  "d"  "  "  "f"  "  "  a  c  e  g  "h"  .,  "j"  "k"  "1"  "  "  "  "  m  n  "  "  "  "  "  "  "  "  "  "t"  "  "  0  p  q  r  s  u  "  "  ..  "  "  "  "  "  "  "  V  'N  X  Y  z  "0"  "2"  u 3 "4"  I  "5"  I  "6"  "7"  ".<,"  "9"  "I I"  AnyCharacterExceptApostrophe. 