What is a Domain Model

Question

I have read the wikipedia definition of a domain model. I still don't get it. I have been reading alot of posts for NHibernate and almost in every post I read I see the term Domain Model. What exactly is it and does any one have an example of a domain model.

Answer 1

This article might help:

http://domaindrivendesign.org/library/evans%5F2004

The basic idea is that the Domain is the problem domain and the model is... well the model of it. The above article is puts it far more eloquently than I would and there are plenty of other resources there if you want to go down the rabbit hole.

Answer 2

Basically, it's the "model" of the objects required for your business purposes.

Say you were making a sales tracking website - you'd potentially have classes such as Customer, Vendor, Transaction, etc. That entire set of classes, as well as the relationships between them, would consititute your Domain Model.

Answer 3

If you were to take your program and strip away the gui and the DBMS, and replace it with a command line interface, and a MySQL server instance, then port the whole thing to a different platform with different system calls and file system access api calls, the part that you didn't change in that process is the domain model.