Abstract
This chapter discusses Rosetta's function definition and evaluation capability that provides function definition and application capabilities, and a collection of advanced capabilities for more sophisticated and powerful specifications. It is noted that like functions in traditional functional programming languages, Rosetta functions provide a mechanism for defining abstractions of expressions over parameters. Unlike functions in traditional imperative programming languages, Rosetta functions are pure and free from any side effects. A Rosetta function simply reduces to a value derived from its parameters and items defined in its static scope. Actual parameters that Rosetta functions are applied to cannot be altered by the function application, nor can other symbols in the static scope be altered. Furthermore, each Rosetta function is simply an encapsulated expression defined over its parameters and items in scope. When evaluated, the encapsulated expression simply reduces to a value that replaces the function application. In this sense, Rosetta functions behave more like mathematical functions than functions and procedures from programming languages.
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