On 13/Jan/2010, at 2:53 PM, Lon Varscsak wrote:
> Is there a way to model an optional to-one relationship from the primary key 
> to a primary key of another object?

*sigh*  As with so many conversations theses days...  What are you trying to do?

My initial response is look at how the Movies.eomodel is setup for Talent and 
TalentPhoto.
That's an example where a large blob was broken off from the main table for 
better storage.
Not strictly 3rd normal form but often done! ;-)   Is that similar to the case 
that you're talking about?
M.
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