 to which the relationship
 attribute corresponds. If the entity's primary key is of the same
 Java type as the primary key of the entity referenced by the
 relationship, the value attribute is not specified.
 
 <pre>
    Example:

    // parent entity has simple primary key

    &#064;Entity
    public class Employee {
       &#064;Id long empId;
       String name;
       ...
    } 

    // dependent entity uses EmbeddedId for composite key

    &#064;Embeddable
    public class DependentId {
       Strin