9. The mobile device of claim 8 , wherein the identified domain agent updates the context stack and the semantic knowledge-based model in response to processing the request.
9. The mobile device of claim 8 , wherein the identified domain agent updates the context stack and the semantic knowledge-based model in response to processing the request. 10. The mobile device of claim 9 , wherein the knowledge-enhanced speech recognition engine determines a most likely context for the follow-up multi-modal input using the updated context stack.