e any direct or indirect inner states
  which themselves have orthogonal regions. This limitation stems from the
  fact that full deep history support would be more complicated to implement
  and would consume more resources than the currently implemented limited
  deep history support. Moreover, full deep history behavior can easily be
  implemented with shallow history:</p>

  <p><img alt="DeepHistoryLimitation2" src="DeepHistoryLimitation2.gif"
  border="0" width="332" height="347"></p>

  <p>Of course, 