Choosing rpm-release for fc1 and fdr add-on rpms

[Ralf Corsepius <rc040203 freenet de>]

Hi,

I am planing to release a couple of rpms which are supposed to be add-on
packages to Fedora Core and/or Fedora Extras.

What is the current convention on choosing rpm release tags for such
packages to provide co-existence for such kind of packages?

AFAIS, from freshrpms, livna, atrpms none there doesn't seem to exist
such kind of convention. Conversely, all seem to be designed "to take
over the system". 

Ralf