> 2. The other way mentioned in the lower diagram where Entity A, Entity B, 
> Entity C and Entity D extend Abstract Entity X and Entity E will have toOne 
> relationship with Abstract Entity X. (This is _desirable_).

Not knowing anymore that that of your model, I would take the Entity Alpha 
option.
Take a look at ERXLongPrimaryKeyFactory in order to ease the fetching of that 
relationship (not to fetch many tables).

jfv


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