Use Case:  Undo Changes to Content

  Actor

    - Content Creator

  Assumptions

    - Content Creator has logged into the CMF (see "Login to the
      Site":LoginAsMember).
    
    - Content Creator has made changes to content which she wishes
      to undo (see "Update existing content":ChangeContent).
      
    - The changes are "undoable"[1].

  Procedure

   1. Select 'Undo' from the actions box.  The system will present
      a list of the transactions which you have permission to undo.

   2. Select the checkbox next to the transaction which you wish to
      undo and click the undo button.  The system will undo that
      transaction and redisplay the list of transactions.

  Notes

  ..[1] Transactions which involve changing content remain undoable
        until one or more objects modified by the transaction are 
        modified by a subsequent transaction.  Normally, this means
        that only the latest transaction to an object is undoable,
        unless the later transactions are also undone.
        
        It is also possible to have transactions above the
        transaction in the list which do not effect the ability to
        undo a change a user wishes to undo.
