[plt-scheme] PLT's version number rules

Hi all -

I am wondering if anyone knows the rules governing the PLT's version
number?  I am interested in comparing and ordering PLT's version numbers.
Below are what I am aware of:

   - before v4, the version numbers are a single integer (300 = version 3.0,
   372 = version 3.72)
   - since v4, the version numbers are <major>.<minor>.<revision>, like
   4.2.2, where all are numbers; and presumably this will be the case for a
   while

Are there other rules?  For example - what would be the rules for pre or svn
builds?

Thanks,
yc
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