如何使用.Net Ria Services与具有相同密钥（“Id”）的对象建立关联？

Say I have two classes and have a requirement that the primary key property must be named "Id" (example: Book and Publisher). The requirement is because I'm working with our companies code generated objects and can't change the way they are generated. These classes have a a foreign key between them: Book to Publisher and is a one to one relationship, where in this case, each Book only has one Publisher.Say I have two classes and have a requirement t