On 07.02.2011 18:25, Mark wrote:
- Buy a blue widget and get 10% off a white widget.
- Buy two white widgets and get $5 off your entire order
- Buy  white and blue widget before 2/15 and get a green widget for free.
Maybe you should try with Java rule based inference engines with "production rules" - like JESS (one I have used in the past) and maybe something like Drools (of which I have only heard about).

Check this page:
http://java-source.net/open-source/rule-engines

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