摘要：Providing composed Web Services based on the QoS requirements of clients is still an
urgent problem to be solved. In this paper, we try to solve this problem. Firstly, we
enhanced the current WSDL to describe the QoS of services, and gave a way to choose
the proper pre-exist services based on their QoS. Then, an evolved Web Service frame
is proposed by adding a new role to the current Web Service frame to realize the QoS
driven composition. Finally, we design and implement a prototype, which can flexible
select and compose Web Services at run time.
关键词：Web Service Composition Service Management WSDL
