code: public final SIBUuid12 getGuaranteedStreamUUID() {
          byte[] b = (byte[]) getHdr2().getField(JsHdr2Access.GUARANTEED_SET_STREAMUUID);
          if (b != null)
              return new SIBUuid12(b);
          return null;
      }
docs: /*
  Get the unique StreamId used by the flush protocol to determine
  whether a stream is active or flushed.
  
  Javadoc description supplied by CommonMessageHeaders interface.