> 2) can scan a very large database trying to find exceptions

[alan]
The jess user contrib library:

http://herzberg.ca.sandia.gov/jess/user.shtml

has excellent framework written by Thomas Barnekow that you might want
to take a look at.

> 3) where the rules used to identify exceptions can be entered 
> or changed flexibly (possibly by the end users)

[alan]
I'd consider using or creating a rule generator for the end users - a
fairly simple one would do just fine. You can create a generator that
uses a subset of jess's capabilities in a controlled fashion, probably
in conjunction with a set of rules you write to support the end user
generated code/data. The more you model the user's input as data and
write more of the rules yourself, the less likely you will run into
problems but may have additional performance overhead.

> We haven't started formalizing the rules yet, but my 
> experience with the users suggests that rules can be complex, 
> with many branches, frequently not clearly defined and based 
> on stochastic variables.

[alan]
Can't help you there...

> 
> Has anybody used a ruled-based engine for Data Quality systems?

[alan]
I am in the process of designing a jess based system to check the
quality of data - only in our case, it's a spectrographic data generated
by an instrument and not business data. Your task will be easier than
mine so if you run into trouble, I'm <censored/> D-;

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