Use the Custom Function API to develop custom functions that you can include in a transformation or workflow expression. The Custom Function API is a framework to create custom functions. It includes common and run-time APIs. The APIs enable PowerCenter to validate expressions with custom functions and use the expressions in workflows.
Use the APIs in the header and implementation files to develop custom functions. You must build shared libraries with the header and implementation files. You specify the shared libraries in a repository plug-in file that you register in PowerCenter. You also copy the shared libraries to the PowerCenter environment.