code: public String getDataset() {
      if (isReference()) {
        final LibrarySet master = (LibrarySet) getCheckedRef(LibrarySet.class, "LibrarySet");
        return master.getDataset();
      }
      return this.dataset;
    }
docs: Gets the dataset. Used on OS390 if the libs are in a dataset.
  
  @return Returns a String