Alternative choices¶

An <alt> child contributes one choice to an alternative question. Depending on the question, the choice can be a proposition, a resolve goal, or a perform goal.

Use in a question¶

Place one or more alt children in an alt_question supplied to findout or raise:

<findout type="alt_question">
  <alt><resolve type="wh_question" predicate="monthly_payment"/></alt>
  <alt><resolve type="wh_question" predicate="interest_rate"/></alt>
</findout>

Resolve/perform alternatives let the user choose which question or action to pursue, for example:

<raise type="alt_question">
  <alt><perform action="book_train_ticket"/></alt>
  <alt><resolve type="wh_question" predicate="train_delays"/></alt>
</raise>

Proposition alternatives¶

For a choice among values of a proposition, use a child proposition:

<findout type="alt_question">
  <alt><proposition predicate="destination" value="chelsea"/></alt>
  <alt><proposition predicate="destination" value="fulham"/></alt>
</findout>

Question parameters can also list propositional alternatives for a question:

<parameters question_type="wh_question" predicate="minute_to_set">
  <alt><proposition predicate="minute_to_set" value="0"/></alt>
  <alt><proposition predicate="minute_to_set" value="1"/></alt>
</parameters>

The alt element has no attributes of its own. It appears as question content; it is not a plan item. See Findout, raise, and Question parameters.