How webkit mark its version number?
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How webkit manage its version number? I find there're at least 3 kinds of version:

1. The way like 85.8.5, 419.3, 531.22.7... in this page --
http://en.wikipedia.org/wiki/Safari_version_history

2. Marked as svn info
For example in Chromium/DEPS :"webkit_revision": "119743"

3. webkit-1.6.1 webkit-1.3.1 ... in this page --
http://repository.timesys.com/buildsources/w/webkit/

What's the relationship among these version labels?