On IStaySharp.NET I created an article that shows you, how you can load a DSL file. This is necessary if you need to access your model from GAT, a Visual Studio AddIn, custom library, etc. The last couple of weeks I am digging into DSL and GAT for creating a set of software factories at Real Software that will be used as a baseline for building applications.
Learning two (DSL & GAT) simultaneously and combining them was not so trivial and there is some learning curve. For GAT there are some interesting resources:
The MSDN forums is a good resource when you have some issues and/or questions. DSL has also a specific forum. The capabilities of DSL are really impressive. Now you have finally the tools to write for example your own dataset designer with code generation!!!