xml-dev - Re: Will XML eat the web?

[Pavel Velikhov <pvelikho@cs.ucsd.edu>]

Matthew Sergeant (EML) wrote:
> 
> > -----Original Message-----
> > From: Paul Prescod [SMTP:paul@prescod.net]
> >
> > "Matthew Sergeant (EML)" wrote:
> > >
> > > You
> > > can use a persistent parsed structure like a DOM maintained in memory,
> > but
> > > for some applications such as a rapidly changing XML database this isn't
> > > always feasible (or is it?).
> >
> > You could continually update the DOMs based on changes in the XML. What
> > exactly are your concerns about this architecture.
> >
>         Not everyone (ourselves included) uses DOM. We started that way but
> found it too resource intensive (large amounts of both processing and
> memory). We switched to a simple expat parser and built our own query
> language based on XQL paths. This gave a huge speed up and drop in resource
> usages, but I still have concerns.

XQL has pretty serious limitations as compared to other XML query
languages. If you 
want to build a  query language comparable in power to OQL then DOM
seems like a 
better alternative. Also DOM should not such a resource hog as it is
now.

Pavel Velikhov

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