60-1
data-item*
   level-number*   Dat-1   [data-clause*]  ...  .

level-number*
    1-9,  01-49,  66,  77,  88, 
data-clause*
   [pic-clause*]  [usage-clause*]  [other-clause*]

pic-clause* - data category                                      02-1
   x
      position for a character from the alphanumeric character set
   9
      position for a decimal digit
   a
      any character from the alphanumeric character set
   n
      a character from the national character set
   1
      position for a boolean character

pic-clause* - sign and decimal point
   s
      indicates the presence of an operational sign
   v
      indicates the position of the assumed decimal point

pic-clause* - floating editing
   z
      for inserting leading spaces replacing all leading zeroes
   *
      for character asterisk replacing all leading zeroes
      for inserting character plus replacing last leading zero
   -
      for inserting character minus replacing last leading zero

pic-clause* - fix editing
   b
      blank - the character space will be inserted
   0
      the character zero will be inserted
      the editing sign control character plus will be inserted
   -
      the editing sign control character minus will be inserted
   .
      the character period will be inserted
   ,
      the character comma will be inserted
   /
      the character slant will be inserted

pic-clause* - floating point
   e
      is used to separate the significant and the exponent

Remarks:
   for other details see links above
    

                                                                 60-2
Dat-1
   [classif-spec*]
      level-1*  ...
   [tab-spec*]
      (subscript-1*  ...)
   [ref-modif*]                                                  85-2
      (position*  :  [length*])

level-1*
   of, in  DatG-2
           File-2
           Rep-2

MX limitations:
   ref-modif* is not implemented