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RE: Compiled XML

  • To: "Alaric Snell" <alaric@a...>,"Mike Champion" <mc@x...>,<xml-dev@l...>
  • Subject: RE: Compiled XML
  • From: "Michael Rys" <mrys@m...>
  • Date: Wed, 27 Mar 2002 20:05:31 -0800
  • Thread-index: AcHVkGlEpOQ8QiKmRIupHApgFR+xRwAfF9tg
  • Thread-topic: Compiled XML

compiled xml
SQL Server 2000 uses a tokenized, binary XML format if it talks to an
OLEDB 2.6 or higher provider that then turns it into XML (in the stream
mode). So yes, binary XML formats do work and are being widely deployed.
They save space (although I agree that using compression on the wire is
normally better), they avoid to/from text serialization etc. Only
problem is that any standardized format will most likely not be useful
for most use cases since it will not cover the specific needs (it would
be a compromise and thus basically useless).

There are several papers at WWW9 and WWW10 on general XML compression
and ATT did some research on XMill. Also some tools basically use the
DOM API (some persistent DOMs), SAX event streams (push) or XMLReader
(pull) interfaces to avoid the serialized form.

Best regards
Michael

> -----Original Message-----
> From: Alaric Snell [mailto:alaric@a...]
> Sent: Wednesday, March 27, 2002 5:02 AM
> To: Mike Champion; xml-dev@l...
> Subject: Re:  Compiled XML
> 
> On Wednesday 27 March 2002 12:53, you wrote:
> > 3/27/2002 6:50:59 AM, Alaric Snell <alaric@a...> wrote:
> > >Hi, Mike! How's the weather? :-)
> >
> > Uhh, lousy, especially compared to Spain last week :~)
> 
> Shame, it's getting quite nice here in London now...
> 
> > The response on this list to the Binary XML discussions
> > has typically been "sounds plausible in theory, I've
> > never seen it work well enough in practice to adopt."
> > I don't have an axe to grind in this discussion other than
> > wanting to answer a very frequently asked question for
> > a newcomer.  Could you share some empirical, quantitative
> > data from real success stories using these techniques?
> > Did you really make significant speed improvements without
> > memory bloat, or significant reduction of memory requirements
> > without additional processor horsepower?
> 
> Well, there was some comment from the Coccoon2 people about a
serialised
> SAX
> event stream format, and the ASN.1 folks have been having fun
comparing
> BER/PER (ASN.1 encodings) with something called Megaco, which is an
XML-
> like
> tree structured textual description too...
> 
> I'll implement what I described in an earlier post, since it'll be a
> useful
> open source tool anyway I'm sure, and do some file size / run time
tests
> at
> the weekend.
> 
> ABS
> 
> --
>                                Alaric B. Snell
>  http://www.alaric-snell.com/  http://RFC.net/
http://www.warhead.org.uk/
>    Any sufficiently advanced technology can be emulated in software
> 
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