Look at page 70 in 
https://developer.apple.com/legacy/library/documentation/WebObjects/UsingEOModeler/UsingEOModeler.pdf

It talks about different ways of modeling inheritance. 



> On Oct 28, 2015, at 8:51 AM, Theodore Petrosky <[email protected]> wrote:
> 
> I am starting a simple CMS for a friend. He needs to track donations. You 
> know a phone bank and people taking money.
> 
> Anyway, I have two kinds of Person. Employees that take money and Donors that 
> give. Both are Person.
> 
> I created a model for a Person then Subclasses for Employee and Donor. I am 
> using a qualifier isEmployee=1 and isDonor=1. Obviously then I have 
> attributes isEmployee and isDonor in Person.  A Person could be both an 
> Employee and a Donor. 
> 
> Would you do this, or would you model separate Entities for Employee and 
> Donar?
> 
> 
> 
> 
> 
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