Demonstrate the symbol used in data dictionary
A number of the symbols used in data dictionary are as following:
X= [a/b] x comprises either data element a or b
X=a x comprises an optional data element a
X=a+b x comprises data element a andb.
X=y{a}z x comprises some occurrences of data elements a which are between y and z.
| Separator
** Comments
@ Identifier
( ) Options