Plug-In Transformation is a skeleton transformation that lets a transformation plug-in do the actual work. All transformations in Standard.uxf are also implemented as transformation plug-ins. You can select any of these as the transformation plug-in to be used together with Plug-In Transformation.
The Transformation parameter sets the transformation plug-in to be used. By default, the Inverse plug-in from Standard.ulb is selected.
See Also
Plug-ins
Standard transformations
Standard plug-ins