实体框架中的类和接口层次结构？

I have two related classes which share a common interface and are both stored in the same underlying database table. However, the Entity Framework generates one common class, where I really need the two distinct classes. How do I resolve this? Is it best to use a base class rather than an interface? How do I change the EF model to provide two classes mapped over one table?I have two related classes which share a common