From the moment of their inception, languages for relational data have been described as sublanguages embedded in a host programming language. Rel is a new relational language that goes beyond this paradigm, with features that allow for programming in the large, making it possible to fully describe end to end application semantics. With the new approach we can model the semantics of entire enterprise applications relationally, which helps significantly reduce architecture complexity and avoid the well-known impedance mismatch problem. This paradigm shift is enabled by 50 years of database research, making it possible to revisit the sublanguage/host language paradigm, starting from the fundamental principles. We present a gentle introduction to Rel and the principles behind its design philosophy.
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