[jdom-interest] Performance issues

[bob mcwhirter]

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.

	-bob

On 18 Oct 2001, Amarnath Venugopal wrote:

> 
> bob,
>     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
> > 
>  
>