W3C Standards and Data Models

Over the last few weeks I have been reviewing a number of W3C standards, mainly around MMI (multi modal interactions) within a commercial context (i.e with a view to implementation in a business) and have become increasingly frustrated by the number of data models and schemas incorporated into each standard using XML and XSD.

Not one data model (MMI, EMMA, SCXML) seems to provide examples using RDF for data serialisations nor have any attempts been made at producing rdf terms to support various rdf serialisations. Obviously, there are huge benefits in doing so.

Does anyone have any ideas on whether this will become a quality aspect of a standard across the W3C i.e for something to become a recommendation, any associated data models must be provided in RDF.

I understand that I can go out and create a vocabulary myself, but generally, the working group is the representative domain expert.