<?xml version="1.0"?>
<vxml version="1.0" > 
  <form id="login"> 
    <field name="pin"> 
  	   <grammar>
		  <![CDATA[
           Four_digits
      	  ]]>
  		</grammar>	
		<prompt>Please enter your 4 digit pin code.</prompt> 
  		<filled>
  		  <submit next="http://www.webreference.com/cgi-bin/perl/20/pin.pl"/>
   	</filled>
      <noinput count="1">No PIN entered.
        <reprompt/>
      </noinput>
      <noinput count="2">You must enter your PIN number to proceed.
        <reprompt/>
      </noinput>
      <noinput count="3">Please press or say exactly four numbers.
      </noinput>		 
   	<nomatch count="1">Invalid pin code.
        <reprompt/>
      </nomatch>
      <nomatch count="2">Please press or say exactly four numbers.
        <reprompt/>
      </nomatch>
      <nomatch count="3">Too many attempts. Please call back another time.
        <exit/>
      </nomatch>
	 </field> 
  </form>
</vxml>
