US Patent 10019259 Code transformation using extensibility libraries

A transformation application may transform source code into transformed code using extensibility libraries. The transformation application may receive an extensibility library and the source code. The extensibility library may include one or more transformation directives that specify a business semantic preserving transform. Accordingly, the transformation application may transform a source application into a transformed application using the business semantic preserving transform. The business semantic preserving transform may change one or more original architectural classes of the source application potentially spanning multiple tiers or devices into one or more transformed architectural classes of the transformed application, in which the one or more transformed architectural classes are different from the one or more original architectural classes.