code: public List<TiffObject> getIfdsAndSubIfds() {
      List<TiffObject> all = new ArrayList<TiffObject>();
      all.addAll(getMetadataList("IFD"));
      all.addAll(getMetadataList("SubIFDs"));
      return all;
    }
docs: Returns a list of subifds.
  
  @return the subifds list