Stefan, I don't mind looking at a working patch; however, it's not clear to me how you intend to solve the iterparse-accepting-a-custom-XMLParser problem. As for faking the new API, I don't know if that's a good idea because we're not yet sure what that new API is. I agree with your earlier observation that we must begin by refactoring the internals (in the C implementation) and defining cleaner APIs for existing objects. Once we do that, we may have better ideas about the ideal API for incremental parsing / event building. But that's a large job.

Again, fully working patches will be considered. Lacking those, I'm inclined to go with the interim solution proposed in http://bugs.python.org/issue17741#msg196133