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From Robert Stuart <Robert.Stu...@NFER-NELSON.co.uk>
Subject RE: [vote] A native XML database project under Apache
Date Fri, 19 Oct 2001 08:04:32 GMT
Relational database theory derives from set theory.  (EF Codd circa 1980)

A tree structure may be viewed as a set of branches each containing a set
branches and leaves.
	The root is simply a branch with no parent branch.
	A leaf is simply a branch with no child branch.

Thus, we are mapping one set-of-sets onto another set-of-sets.


-----Original Message-----
From: Henning von Bargen [mailto:H.vonBargen@triestram-partner.de]
Sent: 19 October 2001 08:49
To: 'general@xml.apache.org'
Subject: AW: [vote] A native XML database project under Apache


> -----Urspr√ľngliche Nachricht-----
> Von:	Robert Stuart [SMTP:Robert.Stuart@NFER-NELSON.co.uk]
> Gesendet am:	Freitag, 19. Oktober 2001 09:45
> An:	'general@xml.apache.org'
> Betreff:	RE: [vote] A native XML database project under Apache
> 
> Any XML document, by definition, must be represented by a tree structure.
> This means that, for all valid XML documents have a clearly defined
> structure.
> 
> Tree structures map, very naturally, into relational databases (pun not
> intended). 
> For the rest of this note, any reference I make to a database (db), assume
I
> mean a relational database.

Sorry, I can't follow you.
Your are right that XML is a tree structure.
But how can a tree structure map naturally into relational databases?

>
> XML documents may (optional) have meta-data associated with them (DTD, or
...
> 
> Robert Stuart
> 

Henning

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