[SQLObject] How do I map this inheritance?

[<jpa...@ya...>]

Hi!

In my application I need to model a base Person class and some inherited 
classes, like Student and Professor, both subclasses of Person.

My problem is that one Person can be both Student and Professor at the 
same time. Also, a Person can be neither Student nor a Professor in a 
first step, but it can became a Student or a Professor (or both) at some 
later time.

How should I do this? Is inheritance a good approach for that? or should 
I just use ForeignKey's on Student and Professor pointing to Person?

Thanks in advance,

João Paulo Farias
jpa...@ya...