Please tell me what are the meanings of the different parts in solaris version number:

for example:

Solaris 10 8/07
Solaris 10 11/06
Solaris 10 6/06
Solaris 10 1/06

What is meaning of different parts.
what is difference b/w above versions.

Please also tell me where I can found details about version formating and detailed difference b/w them.