[hibernate-dev] TypeDef annotation

Hey, guys, I tried to find the requirements for @TypeDef#typeClass class property. I thought it is neccessary that typeClass be an implementation of org.hibernate.usertype.UserType interface, but seems it is not true. Could you please help me with the questions: 1. If typeClass should implement org.hibernate.usertype.UserType interface 2. Can it be a primitive type 3. Any other requirements Or would be nice if you point me on some doc which describes al possible usages of the annotation. Thanks, Dmitry Geraskov