Use the action-state element when you wish to invoke an action, then transition to another state based on the action's outcome:

<action-state id="moreAnswersNeeded">
    <evaluate expression="interview.moreAnswersNeeded()" />
    <transition on="yes" to="answerQuestions" />
    <transition on="no" to="finish" />
</action-state>
        

The full example below illustrates a interview flow that uses the action-state above to determine if more answers are needed to complete the interview:

<flow xmlns="http://www.springframework.org/schema/webflow"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/webflow
                          http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">

    <on-start>
        <evaluate expression="interviewFactory.createInterview()" result="flowScope.interview" />
    </on-start>

    <view-state id="answerQuestions" model="questionSet">
        <on-entry>
            <evaluate expression="interview.getNextQuestionSet()" result="viewScope.questionSet" />
        </on-entry>
        <transition on="submitAnswers" to="moreAnswersNeeded">
            <evaluate expression="interview.recordAnswers(questionSet)" />
        </transition>
    </view-state>
    
    <action-state id="moreAnswersNeeded">
        <evaluate expression="interview.moreAnswersNeeded()" />
        <transition on="yes" to="answerQuestions" />
        <transition on="no" to="finish" />
    </action-state>

    <end-state id="finish" />
    
</flow>