Internet-Scale Web Services-based Event Notification Systems

Internet-scale Web services-based event notification services face several new challenges that have not been addressed in traditional event notification systems. In this paper, an Open Publish/Subscribe (OPS) model is proposed to address these new challenges. The openness of OPS model enables collaboration among different event notification systems from different organizations. The layered architecture of this model separate different concerns in event notification systems and can be used to address several challenges in Web services-based event notification systems. Two issues we will address in the thesis are supporting the expressive XPath filtering on XML messages without losing scalability and reconciling the competing Web services specifications on such systems.