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> -----Original Message-----
> From: Andrew Layman [mailto:andrewl@microsoft.com]
> 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.
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