[ic] Shipping in Interchange 6

[Greg Sabino Mullane]

> The conditions are in a tree structure and a shipment rate belongs
> the root node of one these conditions.

I'm not sure why this warrants the complexity of a tree (perhaps a 
better example?), but:

> Adjacency list
> Nested set
> Closure table (aka bridge table)
> Materialized path (path enumeration)

Adjacency list should be ruled out if we still want to support MySQL (no CTEs!)

I think any of the others will be fine. The data set will be so small I don't 
think relative read or write speed should really matter. I would find one 
that is familiar to whomever wants to champion/write it. FWIW, I prefer 
nested set for smallish data sets.

-- 
Greg Sabino Mullane greg at endpoint.com
End Point Corporation
PGP Key: 0x14964AC8
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