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RE: Some random noise on rational type systems for XML

• To: "'Amelia A.Lewis'" <amyzing@t...>, 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 15:45:16 -0700

> The SQL people
> encountered this, and found a solution, which made them 
> heretics in the
> eyes of the relational true believers.  The problem is that 
> whenever you
> have a thing that has a value, it is often useful to be able to say
> "don't know" "not specified" "undefined" "null" or "nil".  W3C XML
> Schema introduces a mechanism for this.  So, umm, why?  XML 
> already has
> a way to say nothing.  Say nothing.  The empty string.  No data.  Not
> specified.  

I would say "data is undefined" and "data does not exist" are two different
things.  SQL treats NULL different from an empty string.  For XML, null
would seem not to be necessary for numbers, since 'empty' would not
necessarily be interpreted as zero.

> Heh.  But this is already too long, and besides, I *enjoy*
> cliff-hangers, so let's just Tune In Next Week for Another 
> Bland Episode

Spring: the silly season.

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