parameters: (self, codeunit, exported_names)
docstring: subclasses must override this to do the real work
docstring_summary: subclasses must override this to do the real work
docstring_tokens: subclasses must override this to do the real work
function: def Export(self, codeunit, exported_names):
          'subclasses must override this to do the real work'
          pass
function_tokens: def Export ( self , codeunit , exported_names ) : pass