> -----Original Message-----
> From: Jeff Lowery [mailto:]
> Sent: Tuesday, May 06, 2003 5:09 PM
> To: Andrew Layman;
> > In XML there are three (not two) syntactic devices that
> people have at
> > various times asserted have some connection to the absence
> of a tuple
> > in the relational model.
> >
> > XML has:
> > 1. Omission of an optional element.
> > 2. Presence of an element having the attribute xsi:nil
> > 3. Presence of an element having empty content.
>
> I don't see how any of these three could be interpreted
> differently if the element content is defined to represent a number.
What if the element [or the tuple it maps to] has a default specified?
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