- You've two sets of results from two queries where the data has been added to the same tree, and you wish to combine these into one result set.
- Create a processing node that copies the two sets of data to the righthand side, in doing so rename the name of the 2nd set of results to the same as the first
- Follow this by another process node which selects according to the names and adds them to the same root
- Effectively this will create one list of results