Qus: What is Transformers?
Transformers are the services you use to accomplish value transformations in the Pipeline view. You can only insert a transformer into a MAP step. You can use any service as a transformer. This includes any Java, C, or flow service that you create and any built-in services in WmPublic, such as the pub.date.getCurrentDateString and the pub.string.concat services. By using transformers, you can invoke multiple services.