public static class ExtraMetaDataBytesDecoder
                    implements Iterable<ExtraMetaDataBytesDecoder>, java.util.Iterator<ExtraMetaDataBytesDecoder> {
        private static final int HEADER_SIZE = 4;
        private final GroupSizeEncodingDecoder dimensions = new GroupSizeEncodingDecoder();
        private StorageMetaDataDecoder parentMessage;