What is the best way to find the delta between 2 versions of a process model?...

You are going to get very little from xml comparison. The files are huge and the order in which objects appear can change from export to export (even with the same version). Your best bet is to document different versions of your model - preemptive measure. At this point, visual inspection will be the most effective.

You are going to get very little from xml comparison. The files are huge and the order in which objects appear can change from export to export (even with the same version). Your best bet is to document different versions of your model - preemptive measure. At this point, visual inspection will be the most effective.