Adaptation
No adaptation: two versions of the same page, one in VoiceXML and one in HTML.
VoiceXML and (X)HTML have lots in common already. XML syntax, URIs.
Therefore Web technology can be applied: HTTP (VoiceXML server by Web servers), XSLT, DOM.
Making it possible to transform and adapt content.
For instance one could easily convert a simple HTML page into VoiceXML:
<transform xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0> <template select="html"> <vxml><apply-templates/></vxml> </template> <template select="p"> <block><apply-templates/><block/> </template> </transform>