Consider the following syntactic definition.
- EXAMple string { example-statement } END
-
- example-statement:==
-
- CHARge=real
-
- EXCLude=( { atom } )
-
- MASS=real
-
- TESTing=A1 A2 A3
-
- TYPE=type
-
- string:==
- any sequence of four characters.
The following input lines are possibilities for valid
constructs:
example A type=ABCD mass=30.0 end
example B type=BBBB charge=5.0 exclude=( A B C D ) end
example C charge=5. mass=40.0 type=XXX testing=A3 end
example D end
Xplor-NIH 2024-09-13