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Throughout the last years, the Service-Oriented Architecture (SOA) paradigm has been promoted as a means to create loosely coupled distributed applications. In theory, SOAs make use of a service registry, which can be used by providers to publish their services and by clients to discover these services in order to execute them. However, service registries such as UDDI did not succeed and are rarely used today. In practice, the binding often takes place at design time (for instance by generating client-side stubs), which leads to a tighter coupling between service endpoints. Alternative solutions using dynamic invocations often lack a data abstraction and require developers to construct messages on XML or SOAP level.
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