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Abstract:
The API of a Web service restricts the ypes of queries that the service can answer. For example, a Web service might provide a method that returns the songs of a given singer, but it might not provide a method that returns the singers of a given song. If the user asks for the singer of some specic song, then the Web service cannot be called � even though the underlying database might have the desired piece of information.
This asymmetry is particularly problematic if the service is used in a Web service orchestration system. In this paper, we propose to use on-the-y information
extraction to collect values that can be used as parameter bindings for the Web service. We show how this idea can be
integrated into a Web service orchestration system. Our approach is fully implemented in a prototype called SUSIE. We present
experiments with real-life data and services to demonstrate the practical viability and good performance of our approach.
