Effective QoS Aware Service Composition Based on Forward Chaining with Service Space Restriction

Several approaches dealing with the performance of QoS aware semantic web service composition have been proposed. We describe an approach which took part at Web Services Challenge 2009. It showed good performance even if large service repositories were processed. We discuss the main principles of the used approach and also its further enhancement. The enhancement includes shorter composition time, consideration of the pre-/post-conditions of services, and adaptation to real conditions where changes of the service set, or the QoS attributes must be effectively managed. Moreover, the lessons learned during the development and the participation of the competition is discussed too.