Mike,
> I have a very good sense of the strengths of relational databases. But
> they are also limited when it comes to object orientaed data (like XML
> records). I though arrays would be a way to simply the complexity you get
> when you try and map objects to relations.
In my experience, most XML records are, in fact, simple tree structures that
are actually easy to represent in SQL. But I don't know about yours.
Certainly the translation of XML --> SQL Tree Structure is no more complex
than XML --> Array, that I can see.
> Is Cache open source?
No. It's a proprietary, and probably very expensive, database. There are no
open source OODBs that I know of, partly because of the current lack of
international standards for OODBs.
> are the XML databases that are evolved and sophisticated enough to use in
> production environments.
I don't know. The last time I evaluated XML databases was a year ago, when
there was nothing production-quality in existence. But I don't know what
the situation is now.
--
-Josh BerkusAglio Database SolutionsSan Francisco