The CAA Document description is correct. You should not compare the two part document, but compare the content of the two part document.
For instance, On R15 you created a solid object in the part1 and save it to the OutputRef, during every ODT test, you run your test case and generate a new part with another solid object, then you compare these two solid from two part documents, such as there volume, COG and etc.
It is good way to catch the regression during the development |