docs: public void xmlWriteOn(FormattedWriter writer) throws IOException
    {
      writer.newLine();
      writer.taggedValue("referencedMsg", msgId);
      writer.newLine();
      writer.taggedValue("AOTicks", tick+","+prevTick);
      writer.newLine();
      writer.taggedValue("gatheredMEUuid", sourceMEUuid);
    }