• To: "'Andrew Layman'" <andrewl@m...>, xml-dev@l...
• Subject: RE: Some random noise on rational type systems for XML
• From: Jeff Lowery <Jeff.Lowery@c...>
• Date: Tue, 6 May 2003 17:09:13 -0700

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

> 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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