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Why Business Rules Engine?

"A good DSL minimizes the 'communication gap' between a domain concept and the code that implements it" - Robert C. Martin
A Use Case It looks like adopting a new technology is always driven by a business need.

The organizations, such as banks, have their own business processes (such as data gathering and document management). These processes are different from others but usually the differences are not big. How do we build a product which can be reused the similar features but still be adaptable with the specific requirements of each bank? Then, the answer is we should have a library/framework. There is an idea that we can implement this library/framework by using a business rules engine. Which has the following benefits:
Be able to modify implementation of business domain at runtime (such as XML, CSV)Source code is more readable for both developers and domain experts. Therefore, source code can be consider it as a document Since Business Rules Engines support for Do…