How well does this work in actual relational products? People like Fabian Pascal and CJ Date have been widely critical of relational vendors for failing to adequately implement the relational model. In my experience while in theory this may be possible in practice it doesn't quite work as well as you might like.
On Friday, October 19, 2001, at 01:04 AM, Robert Stuart wrote: > 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:[EMAIL PROTECTED]] > Sent: 19 October 2001 08:49 > To: '[EMAIL PROTECTED]' > Subject: AW: [vote] A native XML database project under Apache > > >> -----Ursprüngliche Nachricht----- >> Von: Robert Stuart [SMTP:[EMAIL PROTECTED]] >> Gesendet am: Freitag, 19. Oktober 2001 09:45 >> An: '[EMAIL PROTECTED]' >> 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 > > --------------------------------------------------------------------- > In case of troubles, e-mail: [EMAIL PROTECTED] > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > In case of troubles, e-mail: [EMAIL PROTECTED] > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > Kimbro Staken The dbXML Project http://www.dbxml.org --------------------------------------------------------------------- In case of troubles, e-mail: [EMAIL PROTECTED] To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
