<sequential>
<vertical>
<poll_question id="first_poll" display_name="first poll">
<h3>What's the Right Thing to Do?</h3>
<p>Suppose four shipwrecked sailors are stranded at sea in a lifeboat, without
food or water. Would it be wrong for three of them to kill and eat the cabin
boy, in order to save their own lives?</p>
<answer id="Yes">Yes</answer>
<answer id="No">No</answer>
<answer id="Dont_know">Don't know</answer>
</poll_question>
<poll_question id="second_poll" display_name="second poll">
<h3>What's the Right Thing to Do?</h3>
<p>Suppose four shipwrecked sailors are stranded at sea in a lifeboat, without
food or water. Would it be wrong for three of them to kill and eat the cabin
boy, in order to save their own lives?</p>
<answer id="Yes">Yes</answer>
<answer id="No">No</answer>
<answer id="Dont_know">Don't know</answer>
</poll_question>
</vertical>
<wrapper>
<!-- Test many show tags -->
<html>Condition: first_poll - Yes</html>
<conditional sources="i4x://HarvardX/ER22x/poll_question/first_poll" poll_answer="Yes">
<html>In first condition.</html>
<show sources="i4x://HarvardX/ER22x/poll_question/second_poll"/>
</conditional>
</wrapper>
</sequential>