[xquery-talk] Re: The State of Native XML databases

John Snelson john.snelson at oracle.com
Mon Aug 20 11:21:46 PDT 2007


Even if I ignore your use of the amorphous and irrelevant term "native 
XML database", there are still some pretty tall claims in this email.

For a start, not everyone likes or wants XML Schema - it does have a 
habit of turning an extensible format into a highly restricted one, 
which I would argue was not very forward thinking. Only once in the 3 
years I've worked on Berkeley DB XML has anyone ever commented that we 
didn't use XML Schema (or any schema language) to restrict the data stored.

You use the term "enterprise persistence" without any kind of 
definition. Can you let us know what "enterprise" use cases are handled 
by TigerLogic that other XML databases cannot handle?

Also, I agree with Michael Kay that collections are in no way a 
relational concept - so this is another red herring.

I'm not pretending to be partisan in this debate, but I do try to stay 
away from marketing spin and sweeping statements.


Ilya Sterin wrote:
> I wish I could find more info on it.  The site states acid
> transactions, but for people people unfamiliar with transaction
> architectures, that doesn't equate being able to use it in an
> enterprise application environment.  If consistency is enforced at the
> collection entry level, that beats the purpose of having a native xml
> database where ddl=xml schema.  In a perfect world, I wish the vendors
> would get rid of the collection as a storage metaphor and instead
> focus on defining schemas with one of the schema languages, which is
> all that's needed.  Why mix relational concepts, which is what a
> collection really is, with native xml hierarchal storage.
> We recently engage in numerous native xml storage projects and worked
> very closely with RainingData on a TigerLogic 3.0 release.  As of
> right now, that is probably the only truly native xml database that
> defines all facilities needed for enterprise persistence in XML.
> Ilya
> On 8/19/07, Dr Orlovsky MA <dr.orlovsky at gmail.com> wrote:
>> On Mon, 13 Aug 2007 22:01:19 -0400, Elliotte Harold wrote:
>>> On another list I was recently asked to sum up the state of native XML
>>> databases, especially open source ones. The result is here:
>>> http://cafe.elharo.com/xml/the-state-of-native-xml-databases/
>>> Comments appreciated.
>> There is excellent native XML dsatabase completelly implementing XQuery.
>> See for Sexdna XML database in google as well as look at the
>> site
>> http://modis.ispras.ru/sedna/
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