Hi,
   Can the 'Obsoletes' and 'Requires' relations be combined together,
directed towards the same target from an RPM?
e.g.

a.rpm -- Obsoletes --> b.rpm
a.rpm -- Requires --> b.rpm


What I want to express is that package 'a' needs 'b' as a prerequisite
('a'  cannot be installed unless 'b' is installed first), but the
installation of 'a' should then obsolete 'b'.

Does RPM allow such semantics?

Thanks!
-Anshuman.