After running features through a transformer that does uses a Group By, is there a simple way to determine which destination features came from which source features? The best I could come up with is some combination of SpatialRelator and FeatureMerger, to do a spatial join on the result.
Edit: For example, I have a source dataset that feeds into a BUFFERER, that I set a group-by attribute on. For each BUFFERER output feature, I wish to associate it somehow with the subset of original features that donated themselves to it. Unfortunately I don't believe the BUFFERER has a List attribute in FME Desktop 2011. How would I do this?
Edit edit: bufferer, not dissolver.