:Goldfritha, we are certainly allowed, and encouraged, to report on theories about the origins of frame tales at Wikipedia, so long as they are sourced. Anyone doing basic research on this topic will find that Michael E. J. Witzel is the leading authority on this topic, and there are no other theories or controversy that I have been able to find, it seems to be the prevailing mainstream view in academia. Also, these are not "fairy tale collections", that is an entirely different genre and article, not sure where your getting "fairy tale" from, these are frame tales.