> For the complete documentation index, see [llms.txt](https://docs.plumvoice.com/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plumvoice.com/dev/voicexml/other-resources.md).

# VoiceXML Resources

The following documents serve as extra references to fully take advantage of all the features that Plum DEV offers.

[VoiceXML 2.0 Specification](http://www.w3.org/TR/voicexml20/)\
[VoiceXML 2.1 Specification](http://www.w3.org/TR/voicexml21/)\
[Speech Recognition Grammar Specification (SRGS)](http://www.w3.org/TR/speech-grammar/)\
[Speech Synthesis Markup Language Specification (SSML)](http://www.w3.org/TR/speech-synthesis/)\
[Java Speech Grammar Format Specification (JSGF)](http://www.w3.org/TR/jsgf/)\
[ECMAScript Language Specification \[PDF\]](http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf)