voicexml的menu例证

voicexml的menu例子
例子来源：http://www.optimsys.cz/support/examples/example12.php
主要的menu的应用
menu下有choice，根据按dtmf值或者说出的值进行选择哪个choice，然后跳转到相应的form，执行form里的语音

<?xml version="1.0" encoding="UTF-8"?>
<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">

<meta name="description" content="menu example"/>
<meta name="author" content="OptimSys, s.r.o., Czech Republic (http://www.optimsys.cz)"/>
<meta name="copyright" content="free for any purpose"/>

<menu dtmf="true">
  <prompt>
    Welcome to main menu. Say the name of the required section or
    <enumerate>
      press <value expr="_dtmf"/> for <value expr="_prompt"/>,
    </enumerate>
  </prompt>
  <choice next="#news">
    news
  </choice>
  <choice next="#sport">
    sport
  </choice>
  <choice next="#weather">
    weather forecast
  </choice>

  <noinput> Please say one of <enumerate/> </noinput>
  <nomatch> I don't understand you. Please say one of <enumerate/> </nomatch>
</menu>

<form id="news">
  <block> Welcome to news. Nothing is here for now. </block>
</form>

<form id="sport">
  <block> Welcome to sport section. Nothing is here for now. </block>
</form>

<form id="weather">
  <block> Welcome to weather forecast. Weather will be either nice or bad. </block>
</form>

</vxml>