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From Jacek Kopecky <>
Subject Progressive DOM (was: Re: JDOM vs DOM)
Date Fri, 03 Nov 2000 09:59:12 GMT
 Hello all. 8-)
 I think we agreed in the IRC discussion that SAX is not the way to go
since handling SOAP is not a stream process. 
 What I envision is that we build on DOM (maybe using JDOM if it's
really a "universal DOMUtils") and when it's really needed, we can
plug in some other DOM implementation built progressively from a SAX
 This Progressive DOM would keep what has been parsed so far, but it
would not parse more than needed and it could provide us with the
SAX form of the rest. A little example:


 The PDOM gets an "element <root> started" SAX event and it would know
we have an XML with its document element <root>. When
getFirstChild() is called the PDOM consumes the following event,
"element <a> started" and it would return the node. If every more
complex method is build on such progressive calls as
getFirstChild() is, we could have excellent efficiency if we only need
the first header in a huge message.
 Anyway, I can't see any reason for huge headers, only huge bodies
make sense. To handle this nicely the PDOM could have a method that
would terminate the PDOM existence _and_ (this seems important) we
could get the SAX stream from now (or from some point in the XML
file). So we would parse what we need and the final handler (who would
have to know it's the final one) could work efficiently with SAX.

 The first thing to implement here would be an API that lets us do the
last step on a normal DOM. Thus we could use a DOM and finish with SAX
when needed and the switch to PDOM would then be seamless.

 Any suggestions? Any kind of PDOM already implemented / in progress?

                            Jacek Kopecky

P.S: hope it was clear enough, I sometimes have problems with
expressing myself in an overly complex way, see? 8-)

On Wed, 1 Nov 2000, Sanjiva Weerawarana wrote:

 > Sorry I missed this chat too; had to take my son to the doc (he hit his
 > leg and it may have been fractured .. it wasn't). 
 > I read the logs and I see discussion of using JDOM instead of DOM as
 > the tree API. I would like to register my early and strong opposition
 > to it .. DOM is a standard API as is SAX and I would like to use those
 > two. This allows the use of pretty much arbitrary XML tools (like 
 > alternate parsers for example as has been brought up) and I'm opposed
 > to precluding those in favor of a non-standard (albeit more programmer
 > friendly) API. This is the life of standards playing .. whether you
 > like it or not you gotta do it. Picking and choosing (or embracing and
 > extending) would put us in the camp of the evil empire.
 > I have some recollection of hearing of a religious war on the JDOM/DOM
 > topic on the xerces list .. if there are any veterans of that war here
 > maybe they could give us the summary (of their side :-))?
 > Sanjiva.
 > ----- Original Message ----- 
 > From: "Glen Daniels" <>
 > To: <>
 > Sent: Tuesday, October 31, 2000 5:05 PM
 > Subject: IRC chat log
 > > 
 > > Here's today's IRC log.  I'm working on the stuff we mentioned, though I
 > > need to push it back a day or two due to local insanity here.
 > > 
 > > I'll mail my prototype tomorrow (need to iron out a couple of bugs from the
 > > last round of changes).
 > > 
 > > Glen Daniels
 > > Allaire Corp
 > > Engineering Manager
 > >
 > >                                 Building cool stuff for web developers
 > > 
 > > 
 > > 

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