I feel like I must be missing something obvious since I can't even find
anyone else asking a similar question...
This is usually just one number. If you want to have builds that are of
the x.x.x (1.2.345) variety look into the various Labeller tasks,
specifically the DefaultLabeller and the <prefix> node.
http://confluence.public.thoughtworks.org/display/CCNET/Labeller+Blocks
Thanks for the quick response Josh.