code: public Date setDatastreamVersionable(Context context,
                                           String pid,
                                           String dsID,
                                           boolean versionable,
                                           String logMessage)
              throws ServerException {
          return worker.setDatastreamVersionable(context,
                                                 pid,
                                                 dsID,
                                                 versionable,
                                                 logMessage);
      }
docs: Delegate to the JournalWorker.