Dependency meaning

[Detlef Vollmann <dv@vollmann.ch>]

This is essentially a follow-up on my question about the
64bit time_t transition.
I'm trying to upgrade some packages manually.
For this, I'm trying to understand the dependencies.

'apt-cache showpkg libssl3t64' gives me this:
> Dependencies: 
> 3.1.5-1.1 - libc6 (2 2.34) libssl3 (3 3.1.5-1.1) openssh-client (3 1:9.4p1) openssh-server (3 1:9.4p1) python3-m2crypto (3 0.38.0-4) libssl3 (0 (null)) libssl3:i386 (3 3.1.5-1.1) libssl3:i386 (0 (null)) openssh-client:i386 (3 1:9.4p1) openssh-server:i386 (3 1:9.4p1) python3-m2crypto:i386 (3 0.38.0-4) libssl3t64:i386 (35 3.1.5-1.1) libssl3t64:i386 (38 3.1.5-1.1) 

I'm trying to understand, what the numbers in parentheses mean.
The second numbers are obviously version numbers.
I guess the first numbers are dependency types, but I have no idea,
what they mean.
The man page says "For the specific meaning of the remainder of the
output it is best to consult the apt source code."
I'd like to avoid this. Can anybody point me to a list what these
numbers mean?

  Detlef