For those on this group who have not signed up for an account on bugzilla, I strongly encourage you to do so. The GWToolset is likely to have a number of changes logged on bugzilla and the more user feedback we can add to the changes the better.
The most recent is Steinsplitter's https://bugzilla.wikimedia.org/show_bug.cgi?id=64634 raised to avoid using GWT created hidden comment fields as markers on the image page. Primarily this marks where the xml source data is logged on an image page, which could be very useful if things are going wrong with the templates on the page, or if someone wants to datamine using original data, rather than the mapped result. Note that the Commons API can do interesting things to support automated changes by identifying sub-sections of an image page and returning the text, but this relies on wiki-style sections rather than hidden comments.
It would be cool if someone could occasionally report back here if there are bugs reported that would benefit from more user feedback either on bugzilla or separately on this list.
Fae