Understanding the numbers in package names (?OT)

[Pavel Rojtberg]

Shriramana Sharma wrote:
> 2. In mysql-common_5.0.22-0ubuntu6.06.2_all.deb, 5.0.22 is the version
> number. What is the 0 before ubuntu? I presume 6.06.2 is the mark of
> the next point release where this package must go?
the 0 is the debian version number. since that particular version is not 
yet in debian at all it is 0.

for the other questions: I'd like to know that to.
Escpecially when that package name change happens (libmetacy0 etc.)

Pavel