Binary decision tree.
Splits on a certain key and goes to the "yes" or "no" child node depending
on the answer. Its Map function calls the Map function of the appropriate
child node. It stores a set of integers of type kAnswerType that correspond
to the "yes" child (everything else goes to "no").
Fields inherited from class edu.cmu.sphinx.linguist.acoustic.tiedstate.kaldi.EventMapWithKey