Most voice applications boil down to the system asking a question, the user making a decision, responding back, and the conversation flow going into one of many choices or branches.

An example of decisions can be seen below:

<decision id="addition">
  <ask>What two numbers would you like me to add</ask>
    <expecting>[[NumOne]] and [[NumTwo]]</expecting>
    <expecting>{Add|Sum} [[NumOne]] to [[NumTwo]]</expecting>
    <say>The sum of [[NumOne]] and [[NumTwo]] is [[app.add(NumOne, NumTwo)]]</say>
    <say>Canceling Addition</say>

Decisions can be easily nested when additional input is needed from a user.