Broken dependencies in universe

[Ryan Thiessen]

While upgrading from Debian Woody to Ubuntu Wart I came across some
odd problems with dependencies.  It seems that certain packages are in
the Warty universe but with broken dependencies.  For example, the
package "imp3" (an integral part of the webmail application Horde)
exists in universe but depends on "php4-common" which does not exist
in universe.  I realize that universe is not officially supported by
Ubuntu, but regardless is this situation something that should occur?

It seems more logical to me that if a package does not exist in Ubuntu
universe, every application that depends on that package should not be
in universe either.  Having broken packages in the repository just
seems tacky and worse than not having the packages available at all. 
Or is there a reason I'm not aware of why broken packages have a
reason to exist in the repository?
-- 
Cheers,
-Ryan Thiessen-