The "tmp" Object

This is similar to msg, except that it is the internal representation of the outbound template configured in your transformer settings. It will only be available in the transformer when you have an outbound template configured.

The tmp variable is used when you want to convert a message from one format to a completely different format (e.g. HL7 v2.x to JSON). Or, it can be used to selectively include pieces of the incoming message and map them into the outbound message.