I suggest there should be
Provides-Corporeal (real files of other package, mostly lib, versioned)
and
Provieds-Virtual {any program of a kind ex:wwwbrowser, not versioned}
cause there are problems with unversioned Provides now
(ex: lib{gtk,gtk-imlib,gnome}-perl and econfigedit) and there is no
need to version virtual packages
old Provides should defaults to one of these
It would also make standarizing lib names someday possible