Example
<vxml version="2.0" lang="en">
<form>
<field name="city">
<prompt>Where do you want to travel to?</prompt>
<option dtmf="1">Edinburgh</option>
<option dtmf="2">New York</option>
<option dtmf="3">London</option>
<option dtmf="4">Paris</option>
<option dtmf="5">Stockholm</option>
</field>
<field name="travellers">
<grammar type="application/srgs+xml" src="/grammars/number.grxml"/>
<prompt>How many are travelling to <value expr="city"/>?</prompt>
</field>
<block>
<submit next="http://localhost/handler" namelist="city travellers"/>
</block>
</form>
</vxml>