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Web Services play an important role in the SOA paradigm, as they allow services to be selected on-the-fly to build applications out of existing components. With the rapid development of web service technology, people are becoming more and more dependent on the convenience from it. Yet, there are many similar or identical function to provide the services, how to make a reasonable choice from these services become a primary problem for solution regarding this problem, a web service QoS predicting algorithm based on QoS Ontology and BP neutral networks is proposed in this paper and QoS Ontology is constructed and BP neutral network are trained accordingly, the evaluating and predicting process is described in detail.
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