RE: [DotGNU] Gzipped XML (was: Disadvantages of XML) - BXML

[Stouf]

 Why don't you use the Binary XML Content Format ...
 see http://www.w3.org/TR/wbxml/

-----Original Message-----
From: Gopal.V
To: Dotgnu Mailing List
Cc: Rhys Weatherly
Sent: 02/01/2002 16:37
Subject: Re: [DotGNU] Gzipped XML (was: Disadvantages of XML)

Hi Rhys,
> Essentially, they chose 1-byte numbers for each tag type,
> and then replaced the tag structure with those numbers when
> transmitting the data over the wireless network.  i.e., instead
> of sending <TABLE>, you would send "3" (or whatever the
> tag value was).  This compacted the XML quite well.
        That works very well if you have no attributes for tags. Add 
a huffman encoding and that's optimisation.
> 
> IMHO, it was a big mistake.  There is a massive version bug in
> how they did it.  Because version 1 clients don't understand
> version 2 tag numbers, it creates migration problems when
> moving to a new version of the standard.  It also lost data:
> DTD's, comments, stylesheets, and other meta information
> were stripped from the input, which made it difficult for
> clients that may want that information.
        Backward compatibility is not only a good idea, it's a
requirment.
> At the end of the day, it is easier to just gzip it and forget about
> the problem.  No data loss, and roughly the same level of
> compaction.  Highly redundant data like XML compresses
> very well.  For example, the 6 Mb All.xml file for the C#
> library specification compresses to ~630k using gzip: about
> 10% of the original size.
        I would have selected Bzip2 if given an option, but it
does not seem to supported enough on platforms (eg Win32,Mac)
(All.xml.bz2=416k). I have been using Java's GzipInputStream 
for my Java+XML programs. Also the CRC32 checks built into 
Gzip ensure data integrity. 

        Well at the end of the day, I'd rather be sleeping rather
than coding on a XML compression no one is going to use. 

        So we reach the consensus that Gzipped XML is our standard
and now all that remains is to use that standard somewhere ;-).

Gopal.V
-- 
 The difference between insanity and genius is only measured by success
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