Author :  Hann Wei Toh

Version 0.4
Date : April 14, 2001
- Changed the term "host" used in the application to "fact", which is used
  more often in artificial intelligence systems.

Version 0.3
Date : February 11, 2001
- Added group support through the use of "shadows", to allow a rule to
  register its interest with a group of similar objects, and be evaluated
  whenever any one of the objects within the group encounters a state change
- Added the capability to convert variable names in a rule to a certain 
  default case, so that an object can be referenced in names of any cases 
  in a rule without causing the rule engine to locate the referenced object

Version 0.2
Date : December 30, 2000
- Added time-based action filtering in expressions
- Added the option "-FilteringInterval <seconds>" to the command line
  to enable the specification of a system level minimum spacing
  between two actions resulted from the same rule
- Added a time field in notification messages
- Added the options "-Batch" and "-NonBatch" to the command line
  to enable notification messages to be sent in batches of 5000 each or
  individually
- Added batch-related methods to the rule server and notification server
  interfaces

Version 0.1
Date : December 26, 2000
- Initial release