What do all these fields really mean in an Ubuntu package version?

Question

For example, in Ubuntu 14.04, dpkg -l bind9 outputs:

||/ Name            Version                      Architecture                 Description
+++-===============-============================-================================================
ii  bind9           1:9.9.5.dfsg-3ubuntu0.15     amd64                        Internet Domain Name Server

The version, 1:9.9.5.dfsg-3ubuntu0.15, looks like it is comprised of many pieces of information. How many sections are there in this Version field, and what are the meanings of them?

From some vague webpage, some conclusions which also needed further confirmation:

• 1 in 1:9.9.5.dfsg-3ubuntu0.15 - epoch

• 9.9.5.dfsg - upstream-version,

• dfsg in 9.9.5.dfsg--- see What does dsfg as a part of package names mean?

• 3ubuntu0.15 - debian-revision

• 3 in 3ubuntu0.15 - see this #debian-revision (thanks to @Rinzwind)

To be solved:

• ubuntu0.15 in 3ubuntu0.15?

• 0.15 in 3ubuntu0.15?