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> -----Original Message-----
> From: Joe English [mailto:jenglish@flightlab.com]
> Sent: Friday, January 25, 2002 1:30 PM
> To: xml-dev@lists.xml.org
> Subject: Re: [xml-dev] Push and Pull?
>
>
>
> Clark C . Evans wrote:
> > On Sun, Nov 25, 2001 at 11:43:49AM -0800, Dare Obasanjo wrote:
> > | No. The pull model has *nothing* to do with an in-memory
> > | representation of the document.
> >
> > Yes. Random vs. sequential access is an othogonal issue.
> >
> >
> > Sequential Random
> > +----------------------------------------------------------
> > |
> > Push | SAX (recursive visitor)
> > |
> > Pull | Pull Parser DOM
> > |
> > +-------------------------------------------------------
> >
> > The confusion arises since SAX and DOM are different
> > in two regards: (a) processing model (push vs pull)
> > and (b) access model (random vs sequential).
>
>
> The way I see it the DOM is more of a "slurp" model --
> the application doesn't get involved during parsing, instead
> it gets the whole tree in one big gulp.
I can agree with this.
>
> I'd describe the main difference as "event-driven" vs.
> "tree-based". Event-driven processing models can have a
> "push" interface (like SAX, where the parser calls the
> application) or a "pull" interface (where the application
> calls the parser).
Thanks, Joe. This is very clear.
Ilya
>
> There are interesting variants on the tree-based model too:
> with the DOM the application crawls caterpillar-like from
> node to node, and in XSLT it iterates over node sets
> generated from XPath statements. With DOM and XSLT the
> entire document is accessible from any node, but in other
> models (HaXml, possibly XQuery) you can only access the
> children and descendants of a node.
>
>
> --Joe English
>
> jenglish@flightlab.com
>
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