Internet and Multimedia Technologies Research Unit

This work proposes a Web Service (WS) discovery model in which the functional and non-functional requirements are taken into account during service discovery. The proposed infrastructure includes a set of services and tools to support an integrated WS discovery and selection solution. A mechanism is introduced that supports three different functional policies. It is able to take advantage of quality information located into a WSDL description file that might be located in a proprietary UDDI registry server or in an independent URL. Moreover it implements a database supported WS intermediary (Broker) that it is also possible to store QoS information for Web Services. A selection module is also presented that delivers the WS that maximizes the value of QoS characteristics among others with the same functionality. An experimental prototype is presented and evaluated in the scenario of air ticket issuing WS selection