As I've been experimenting with inheritance, I think my hang ups are 
largely due to my lack of understanding of how SA accomplishes it.  So 
here are some simple questions.

1. What does it mean for a mapper to inherit from another mapper?  What 
does it inherit from that mapper and how does that affect its function?

2. What does "Concrete" mean?  Is it only applicable to inheritance?

3. When should I use select_table instead of passing in a selectable for 
local_table?

Randall


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