What does VoiceXML look like?

<vxml version="2.0" lang="en">
  <form>
    <field name="city">
      <prompt>Where do you want to travel to?</prompt>
      <grammar src="travel.xml#cities"
       type="application/grammar+xml"/>
    </field>

    <field name="travellers" type="number">
      <prompt>How many are travelling to
        <value expr="city"/>?</prompt>
    </field>

    <block>
      <submit next="http://www.acmetravel/bookings"
        namelist="city travellers"/>
    </block>
  </form>
</vxml>