>I want to create a very flexible program to interpret employee key punches (in, out, and perhaps missing) and by using a schedule and a previously defined set of rules, calculate the different rates of pay applicable.
>
>The rules may be very complex and they can be totally different from one locale to another. Essentially I would like to implement a rule definition language with which to write the rules. Can anybody point me towards some reference?
>
>TIA,
>
>Alex

Well, I suppose you have tried this, but anyway:
http://www.google.com/search?q=%22rule+definition%22+language