UX- An Architecture Providing QoS-Aware and Federated Support for UDDI

—With more and more web services appearing on the web, web service's discovery mechanism becomes essential. UDDI is an online registry standard to facilitate the discovery of business partners and services. Service requesters can choose good performance web services by manual test and comparison. However, this choosing procedure costs lots of time and energy. The ability to predict the quality of service is missing in UDDI. Furthermore, private UDDI registries in federated organizations should be able to share the service descriptions and the service performance information. To address these problems, we propose UX (UDDI eXtension), a system that facilitates requesters to discover services with good qualities. In each domain, the requesters' QoS feedback is received and then stored in a local database. By sharing these experiences from all the requesters in the local domain, the system can predict the service's further performance. The discovery between different cooperating domains is supported and the links between domains are maintained dynamically. The UX server's inquiry interface conforms to the UDDI Specification.