Primary and Foreign Keys

["Bullard, Claude L (Len)" <clbullar@ingr.com>]

A more fun question:

Given a relational database for which one creates a 
parallel XML schema, how do others think key relationships 
should be described:

1.  Simple types with the insurance that corresponding 
values exist in both tables (doesn't seem very strong to me).

2.  Key/keyrefs

3.  ID/IDREFs (probably a non-starter given the caveat)

4.  XLinks

Caveat:  It is usually the case that the schema will be broken 
up into multiple schema given that the original is 
for a very large (field and table wise) relational 
system. Also note, this is going from relational to 
XML Schema, not the other way around.

Len 
http://www.mp3.com/LenBullard

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