The Start Program Export (STRPGMEXP) command identifies the
beginning of a list of exports from the service program T1520SP1.
The Export Symbol (EXPORT) command identifies the symbol name
taxrate to be exported from the service program T1520SP1.
The symbol name taxrate, identified between the STRPGMEXP
PGMLVL(*CURRENT) and ENDPGMEXP pair, defines the public
interface to the service program T1520SP2. Only those
procedures and data items exported from the module objects making up the ILE C
service program can be exported from this service program.
The symbol name taxrate is enclosed in apostrophes to maintain
its lowercase format. Without apostrophes it is converted to uppercase
characters. (The binder would search for TAXRATE, which it would not
find.)
The symbol name taxrate is also used to create a
signature. The signature validates the public interface to the service
program T1520SP2 at activation. This ensures that the ILE C
service program T1520SP1 and the ILE C program T1520PG1
can use service program T1520SP2 without being re-created.