The Common Algebraic Specification Language (CASL) is a general-purpose specification language based on first-order logic with induction. Partial functions and subsorting are also supported.
Overview Designed by the Common Framework Initiative (CoFI), with the aim to subsume existing specification languages, and is implemented in four orthogonal levels: basic specifications for the specification of single software modules, structured specifications for the modular specification of modules, architectural specifications for the prescription of the structure of implementations, specification libraries for storing specifications distributed over the Internet. The structural, architectural, and algebraic specification infrastructure can be extended beyond CASL. For this purpose, it has been formalized as a logical institution.
Extensions Several extensions of CASL have been designed: HasCASL, a higher-order extension CoCASL, a coalgebraic extension CspCASL, a concurrent extension based on CSP ModalCASL, a modal logic extension CASL-LTL, a temporal logic extension HetCASL, an extension for heterogeneous specification
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