[jdom-interest] Using NanoXML and JDOM

Dennis Sosnoski dms at sosnoski.com
Mon Oct 1 15:17:09 PDT 2001

Hi Paul,

I'd be interested in seeing how you tested JDOM vs Xerces DOM. My own tests have
shown the two about the same speed, but Xerces DOM with considerably less memory
consumption per document. You can see some older results at
http://www.sosnoski.com/opensrc/xmlbench/results.html; the newer results will be
published soon, but don't show any substantial change in the JDOM vs DOM memory size

Xerces parser is definitely slow, though. It looks especially bad on small documents,
so I assume it has initialization issues.

  - Dennis

Paul Libbrecht wrote:

> Actually, I'd highly recommend to get rid of Xerces as soon as you're no
> more interested into its (probably powerful) flexibility...
> A candid benchmark happened to me as follows: to parse the same set of 40
> files exposing DOM using Xerces takes the double of the time as parsing
> the same files fire SAX-events to JDOM using Xerces which, in turn, takes
> the double of the time to using Michael Kay of ICL's revisited AElfred
> parser to fire SAX events.
> Oh, and for the comparison, the JDOM docs loaded in RAM take the half of
> the memory of the DOM-exposing objects of Xerces for the same collection
> of files.
> So if you are interested only at the JDOM objects, do, do, do, change
> parser.
> Michael Kay's revisited AElfred parser has a BSD license and, this is
> probably why you're interested at it, is extremely small: 29 Kb compressed.
> What's greatest, it holds in two source files !
> More info from his Saxon page (the parser is included in it):
>         http://users.iclway.co.uk/mhkay/saxon/
> Aside of not supporting DOM, I'd urge JDOM gurus to consider including it.
> This would be even more friendly as he has made glue code to accept JDOM
> documents as transformation source (which is, I believe, an optimal way).
> Paul
> On Mercredi, septembre 19, 2001, at 04:01  PM, Sebastien Pierre wrote:
> > Hi all,
> >
> > Is it possible to use another SAX parser than the ones that comes with
> > JDOM?
> > I was thinking about NanoXML.
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