If you plan to roundtrip and need the result to look like the original (except for the changed data of course) you may have to resort to using the "raw" and "raw extended" rules and/or use a data structure that maps to the right XML. The data structure produced by the module doesn't keep any extra information about the XML it results from and the XML produced from a data structure is the "least complex one that can hold the data". You have to be a bit careful to roundtrip successfully. :-)