Further to the [https://www.redhat.com/archives/fedora-devel-list/2009-May/thread.html#01083 discussion on f-d-l this week] I think the following should be added as a new section to the [https://fedoraproject.org/wiki/Packaging/Guidelines Fedora packaging guidelines]. This text is taken from Seth Vidal's comment, verbatim, and I think it is suitable text, although FESCo members might want to discuss the exact wording:

"No broken dependencies are allowed for package or update (including updates-testing) for any given release version of the fedora linux distribution."