18. The computer system of claim 16 , wherein each application domain model includes elements corresponding to propositions specific to interfacing with the respective speech-enabled application.
16. The computer system of claim 7 , wherein the speech center is further configured to process the recognized utterance using the grammatic specification of the application domain model associated with the target application to produce an initial semantic representation based on the recognized utterance provide a set of propositions that represent the recognized utterance based on the initial semantic representation determine a goal corresponding to the set of propositions and generate a response to the set of propositions according to the goal.