## Encyclopedia > VoiceXML

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# VoiceXML

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[?]

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