Version numbering?

[Warwick Burrows]

Hi guys,
 
What is the idea behind the version numbering in Slide (or is it
WebDAV). The versions start at 1.0 and keep incrementing -- never
reaching 2.0 as far as I can tell. When the UPDATE method is used to
select an earlier branch (the closest thing to deleting a revision that
Slide seems to have) then the revisions will branch.  Can a 2.0 version
ever be reached? Is the version number design part of the WebDAV spec or
just Slide's implementation?
 
Thanks,
Warwick