Hello, I try to use grammar in my voicexml file. At first i tried an In-line grammar. I used an example from a website, but it doesn't work.

here is the code:

<?xml version="1.0" encoding="UTF-8"?> 
<vxml [...]  version="2.0">


<form id="test">

<field name="var">
<prompt>choose</prompt>

<!-- ABNF -->
<grammar> one | two | three| four </grammar>

<filled>
you chose <value expr="var"/> 
</filled>

</field>


</form>
</vxml>

thanks