EMMA shows yet another example of how XML technologies are usable in many contexts, here: multimodal and NLP

Still, lots of options: RDF, RDF/XML, XSLT/SMIL, DOM-IDL/WSDL, maybe more..

Multimodal interaction on the Web is a new problem, which connects it to many W3C activities: not just about XML, but also new devices (XHTML, CC/PP, SVG/CSS), accessibility, internationalisation, Web services, etc.