[jdom-interest] Performance issues
bob at werken.com
Thu Oct 18 05:33:31 PDT 2001
Xerces is used as a SAX-based parser. Basically, something that can
read a byte stream of an XML document, and generates SAX events.
Most any SAX-flavored parser will do, actually.
On 18 Oct 2001, Amarnath Venugopal wrote:
> B'fore going to clear my query, i just need to know the usage of XERCERS in JDOM ???
> just for some clarifications !!
> On Wed, 17 Oct 2001 bob mcwhirter wrote :
> > > JDOM internally uses XERCES / XALAN for
> > parsing the XML Documents and gives an wrapper around
> > for ease use of the XML with well know methods &
> > Classes.
> > > Thats one of the main adv. for using JDOM right !!!
> > if anythign else clear me at this point.
> > > Coming to realtime implementaion of JDOM we're
> > supposed (atleat for our own implementaions) give an
> > wrapper around the JDOM for our application access.
> > > So, this create an three layers over the XML
> > Document to access. First layer by XERCES(innermost),
> > Second layer by JDOM and Third one is the our own
> > layer(outermost) we're providing.
> > >
> > > By using 3 layers, this gives an performance
> > issues where the XML Datas are passed b/w 2 layers
> > b'fore coming to the owr layer. Rather than using these
> > 3 layers, we can provide One layer for accessing XML
> > Docuemnts and our own layer.
> > There really isn't a layer of objects from the
> > Xerces/SAX layer.
> > JDOM receives SAX events, and builds objects. Doesn't
> > wrap anything
> > provided by Xerces. JDOM does *not* provide a wrapper
> > to DOM.
> > It just converts events (energy) to objects (mass),
> > following normal
> > conservation-of-mass laws from physics.
> > What's the point of your application's wrapper layer
> > over the
> > JDOM objects?
> > Questions like this are always better if you can
> > include a
> > use-case of not what you're doing right now, but what
> > you're
> > attempting to do. Sure, you're wrapping JDOM objects,
> > but
> > *why*?
> > -bob
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