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Large software systems are typically composed of multiple layers, written in different languages and loosely coupled using a string-based interface. For example, in modern web-applications, a server written in Java communicates with a database back-end by passing in query strings. This widely prevalent approach is unsafe as the analyses developed for the individual layers are oblivious to the semantics of the dynamically constructed strings, making it impossible to statically reason about the correctness of the interaction. Further, even simple refactoring in such systems is daunting and error prone as the changes must also be applied to isolated string fragments scattered across the code base.
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