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Re: Data streams

• To: Bob Foster <bob@o...>
• Subject: Re: Data streams
• From: Rick Marshall <rjm@z...>
• Date: Tue, 07 Dec 2004 12:03:43 +1100
• Cc: "Stephen E. Beller" <sbeller@n...>, xml-dev@l...
• In-reply-to: <41B4FEEA.4050404@o...>
• Organization: Zenucom Pty Ltd
• References: <00cd01c4dbbe$8c3ca3b0$6501a8c0@dell8100> <41B4F55F.8050806@z...> <41B4FEEA.4050404@o...>
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Bob Foster wrote:

> I don't think so.c Did you look at the sample he posted?
>
> > Every one of the XML data elements had this tagging structure:
> > <Row>
> >    <Cell><Data ss:Type="Number">1</Data></Cell>
> > </Row>
> >
> > In contrast, the CSV had this structure: 1,
>
> Since the "more information" in the XML, precious little that it adds, 
> is identical for every data value, the XML format has approximately 
> the same entropy as the CSV file. This looks more like a failure of 
> the compression algorithm.

whoops. do we know what the compression algorithm was? and was that 
really the structure or just a summary of the structure?

rick

>
> Bob Foster
>
> Rick Marshall wrote:
>
>> all you've done is shown that the entropy of the xml file is 
>> significantly lower than the csv file. that would mean it carries 
>> significantly more information and as others have pointed out, when 
>> inspecting the xml, this is indeed the case.
>>
>> put another way the correct interpretation of your experiment is that 
>> the ratio of the compressed file sizes points to a significant 
>> difference in information content. the csv file and the xml file 
>> aren't the same stuff.
>>
>> rick
>
>
>

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