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Layer Supertype with Entity Framework...

I was wondering if anyone had any success implementing a layer supertype for their Entities using POCO and Entity Framework v4. The layer supertype mainly deals with the common identity features of my entities, and has been designed for my POCO classes, but I am unsure how to map the object design to the database using edmx?

ie Customer : EntityBase where entity base contains the Id key for the Customer, and every other entity. CustomerTable (CustomerId(PK), CustomerName, etc etc...) is the table, where every table has an ID key.

Cheers,

Steve

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