VoiceXML is an XML format for creating interactive dialogues between a human and a computer. It features speech synthesis, automatic speech recognition, call control and soundfile playback. VoiceXML is part of W3C's Voice Browser Activity. http://www.w3c.org/voice.
The following is an example of a VoiceXML document:
<?xml version="1.0"?>
<vxml version="2.0">
<form>
<block>
<prompt>
Hello world!
</prompt>
</block>
</form>
</vxml>
When interpreted by a VoiceXML interpreter this will output "Hello world" with synthesized speech.
Two related formats that can be used within VoiceXML are Speech Synthesis Markup Language SSML[?] and Speech Recognition Grammar Specification SRGS[?]
