A system, method and computer program product for providing data event processing and application integration is provided. The present invention provides a novel application integration and event processing server that creates unified and personalized applications on demand out of existing Web services, communications systems, legacy assets, and databases for several types of applications without invasive programming. The present invention also provides a novel XML-based open markup language that allows real-time composite applications (for execution on the server of the present invention) to be easily created and changed while minimizing low-level coding by using a set of pre-defined templates, thus saving the time and expense typically required to create similar solutions from scratch.