What is meant by domain logic and does that comes in the domain model class?

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Newsgroups gmane.comp.programming.domain-driven-design
Message-ID <[email protected]> 
Hi,    I'm new to DDD and I have collected some domain objects for payment gateway project. Now my task is to write domain logic for those domain objects. I can't understand, what is domain logic?.  Anyone give some illustration for domain logic and it would be very helpful for me.
 

 Thanks,
 Rajesh
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