Sailboat.java

@Entity
public class Sailboat
{
    @Identifier
    @Attribute
    protected String registrationCode;

    @Attribute
    protected String name;

    @Relationship(type = RelationshipType.ONE_TO_ONE, 
                  inverseClass = Skipper.class, 
                  inverse = "sailboat", 
                  cascadePolicy = CascadePolicy.ALL)
    protected Skipper skipper;

    // getters and setters
}