Unified messaging state machine

A unified messaging (UM) application benefits from platform independence and human intelligibility of eXtended Markup Language (XML). A finite state machine (FSM) of the UM application is created utilizing an XML feature to create a valid menu state based upon a UM software component. For a UM software component that is a context or setting of the UM application, an XML conditional attribute conditions a prompt, transition or grammar node of the UM FSM. For a UM software component that is an XML snippet, an XML importation element replicates the XML snippet upon compilation, avoiding time-consuming and error prone requirements for manual code duplication. For a UM software component such as an external method, function, variable or action, a function wrapping XML tool validates the existence of such external UM software components at build time and captures version information to verify the availability of the same version upon execution.