[ROOT] version control in a tree

From: HP Wei (hp@rentec.com)
Date: Tue Jan 21 2003 - 21:31:50 MET 

hi,
  I have not tried out the 'version control' stuff in ROOT.
  I figure that it is faster to ask to get answers to the following
  questions.

  Suppose I have a big tree (tr) 
  with several branches and having millions of events.
  
  Suppose I change the value in event i in one branch (say, br3).
  After the tree is saved to the file,
  I understand the tree in the file contains the old version
  of br3.  In addition, the new version of the branch is also saved.
  The question is how this is done.
  Does the file contain
  one WHOLE copy of br3 with event i having the new updated value?
  Or does ROOT just store the difference between the new and the old
  version ?
  
Thanks,
HP

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