[Fwd: Sun XML early access]

[Simon St.Laurent]

Forwarded for David Brownell:

Tyler Baker wrote:
> 
> The SAX support is solid and the only SAX Parser that is faster that I am
aware
> of is XP.  This is understandable since I have personally found that XP's
I/O
> routines are tons faster than the java.io classes which the SUN Parser uses.

I/O is only one factor.  I think you'll find that diagnostics are much more
useful from Sun's parser.  If we hear performance is an issue, we can put
more work into that, too.

Comparing validating parsers is also interesting.  I don't think there's a
faster validating parser, in 100% Pure Java, generally available today.


> Everything in the com.sun.xml.tree package (including the DOM support) is
poorly
> implemented (and that is a claim I make without even looking at the source).
> When parsing Jon Bosak's ot.xml I get out of memory errors on the second
try,
> even after trying to reclaim memory from the first try (I had to write my
own
> benchmarks as the there were none supplied.).  Besides the memory problems,
> building the DOM tree is incredibly slow.  Better off to stick with
something
> else like Docuverse for now.

The release notes point out that object model support hasn't been tuned
for space utilization; that's different from "poorly implemented"!  And
along the same lines, this is "early access" -- as in, alpha test, so
honest bugs are to be expected.  (Report them to the feedback alias.)

Since it doesn't maintain any static state, I'd suspect that your benchmark
is saving something which causes that error.  If not, we'd certainly fix
such a bug in our code!


> The package is pretty much just SAX and DOM support and some experimental
stuff
> dealing with beans.

"Pretty much" -- but do look at the rest.  It supports the current draft
of XML namespaces, and lets you write DOM objects out as XML text (which
DOM doesn't provide).  DOM doesn't give access to the ID attribute of a
node (unless you know what DTD it's using!), so you can't implement full
XSL or XPointer with just DOM.  And there's more.

- Dave


Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer
Cookies / Sharing Bandwidth (November)
Building XML Applications (December)
http://www.simonstl.com

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