Comment # 3 on bug 925613 from Dominique Leuenberger

That would work in a lot of projects, but surely not all. e.g. GNOME:Next is
linking to multiple devel prjects, as it's there for 'major' updates across the
palette.

For 'regular' devel projects, one could assume that the parent would be the
same for all packages.

Except: the ones that are not links might, or might not, have to be submitted.
There is no default answer correct