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Re: storage Structure



On Sat, 07 Apr 2001, Eric Richardson wrote:
> Wenzel Forster wrote:
> > 
> > On Thu, 5 Apr 2001 10:29:51 +0200
> > Falko Braeutigam <falko@smb-tec.com> wrote:
> > 
> > > On Wed, 04 Apr 2001, Margit Lang wrote:
> > > > Hi,
> > > > I am a student from Austria and have a question about the database
> > structure
> > > > used in ozone. What kind of database is it exactly?
> > > Can you be more specific? What exactly do you want to know???
> > >
> > > > And how are especially
> > > > XML files stored in the database?
> > > The current version uses one database object for each DOM node and
> > clusters
> > > those DOM nodes just like any other database objects. Wenzel is about to
> > play
> > > with some other approaches in order to come up with a design that is
> > faster
> > > and scales better. Wenzel, any news?
> > 
> > No news yet, still looking at the fundamentals. But I'll let you know as
> > soon as they come up.
> > 
> > > > Are there any connections of ozone to the
> > > > project Lore (from Stanford university)?
> > > No.
> > 
> > There are a couple of basic differences between ozone and Lore affecting
> > their usability: Lore is a finished research project and therefore
> > maintenance is discontinued. On the other hand ozone as being constantly
> > worked on. But what really makes the difference is the fact that ozone is
> > open source and free to use in any circumstances (not just evaluating,
> > personal use or similar).
> > 
> > At Stanford's Lore project they also mention their 'Ozone' project that is
> > (was?) built on top of O2. But I've not seen anything about this 'Ozone'
> > being used anywhere. Are maybe the people at INRIA / Xyleme(SA) using this
> > technology? Wouldn't be surprising, but I haven't got a clue.
> > 
> > This leads me to another point, now referring to ozone/XML: besides the
> > couple of projects mentioned on the website I don't know if anybody is
> > really using it. Would be nice to know about some real usecases. This
> > is probably one of the drawbacks of not dealing with a commercial product
> > where you might just go through your list of licensees. But even them commercial
> > vendors only seem to be 'able to do everything and really fast'. So I'm
> > just hoping to see some XML benchmark results in the near future.
> 
> I'm very interested in using the XML portion of ozone. This is as close
> to a schema-less system as you could get for structured data. I tried
> out the example today and even did a XPath query on the loaded file. XML
> databases are a pretty hot topic and I'm sure ozone will be one of the
> fastest. The trouble is that you have to know Java, XML, XSLT/XPATH,
> SAX, DOM plus ozone for it to be of interest. It's not immediately
> obvious why someone want such a beast at least for mortals(like me).

J2EE and EJB are for sure more complex and people love it! ;) ozone/XML maybe is
somewhat complex, I agree. But this is true for all XML database solutions. If
you need the functionality then you have to learn to deal with it - no way
around ;)


Falko
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______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com