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Software services are, just like any other software system, subject to permanent change. The authors argue that these changes should generally be transparent to service consumers. However, currently consumers are often tied to a given version of a service and have no means of easily upgrading to a newer version. This paper proposes a WSDL-driven classification of Web service change types and discusses a versioning mechanism for service-oriented systems that considers revision management on registry and client-side.
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