VoiceXML example - continue

 <field name="drink">
   <prompt>What do you want to drink?</prompt>
   <nomatch>Select one of coke, sprite and watter</nomatch>
   <noinput>Select one of coke, sprite and watter</noinput>
   <grammar src="pizza.grxml#drink"/>
  </field>
  <field name="ack">
   <prompt>Did you ordered <value expr="kind"/> pizza with <value
   expr="topping"/> and <value expr="drink"/>?</prompt>
   <grammar src="yesno.grxml"/>
  </field>
  <filled>
   <if cond="ack=='yes'">
        <prompt>Order submited</prompt>
   <else/>
        <clear namelist="kind topping drink ack"/>
   </if>
  </filled>
 </form>
</vxml>