Encaspulation: What to export

[Victor Porton <porton@narod.ru>]

I am writing free software containing a kinda parser, which converts from 
external representation into the internal format of my Ada program.

What should be in the public package interface and what in package body 
only?

Should I export only the parser for the main object (as it is the only 
parser used by the rest of the program)?

or should I export parsers for all subobjects (because exporting only the 
main parser and not exporting the rest ones is kinda asymmetric: some parser 
is exported and some are not)?

-- 
Victor Porton - http://portonvictor.org