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Re: overstock.com adds GoodRelations in RDFa to 900,000 item pages

From: Martin Hepp <martin.hepp@ebusiness-unibw.org>
Date: Thu, 7 Oct 2010 20:57:59 +0200
Cc: Karl Dubost <karl+w3c@la-grange.net>, public-lod@w3.org, semantic-web@w3.org
Message-Id: <336B0AF8-2C46-4DCD-AB0E-31CC417B9D24@ebusiness-unibw.org>
To: Paul Houle <ontology2@gmail.com>
Hi Paul:

On 07.10.2010, at 17:56, Paul Houle wrote:

> On Wed, Oct 6, 2010 at 5:09 PM, Martin Hepp <martin.hepp@ebusiness-unibw.org 
> > wrote:
>     I've got mixed feelings about "snippets" vs "fully embeded  
> RDFa".  For the most part I think systems that use snippets will be  
> more maintainable,  but I've seen cases where fully embedded RDFa  
> fits very well into a system and there may be cases where the size  
> of the HTML can be reduced by using it -- and HTML size is a big  
> deal in the real world where loading time matters and we're  
> increasingly targeting mobile devices.
>

That is a common misconception - even very comprehensive RDFa in  
snippet style has less than 1% impact on the uncompressed size of  
typical HTML documents, see slide # 11 in

http://www.slideshare.net/mhepp/goodrelations-semtech2010

The additional complexity of maintaining RDFa that is densely  
interwoven with the content for rendering is usually not worth any of  
the potential savings in page size, in particular since

- the redundancy will be partly compensated by HTTP compression
- the page loading time has also a fix part for DNS look-up etc., so  
that a linear increase in page size will not linearly increase the  
loading time.


>     The RDFa issue that really bugs me is that a linked data URI can  
> be read to signify a number of different things.  Consider,  for  
> instance,
>
> http://dbpedia.org/resource/Rainbow_Bridge_(Tokyo)
>

What you are describing is no RDFa-specific issue, afaik, because it  
is fairly easy to define separate URIs for documents and non-documents  
using the about attribute, e.g. with a hash.

The only RDFa-specific clash I see are hash URI references that may  
mean different things from an HTML and from an RDFa perspective.


Martin


--------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

e-mail:  hepp@ebusiness-unibw.org
phone:   +49-(0)89-6004-4217
fax:     +49-(0)89-6004-4620
www:     http://www.unibw.de/ebusiness/ (group)
          http://www.heppnetz.de/ (personal)
skype:   mfhepp
twitter: mfhepp

Check out GoodRelations for E-Commerce on the Web of Linked Data!
=================================================================
* Project Main Page: http://purl.org/goodrelations/
* Quickstart Guide for Developers: http://bit.ly/quickstart4gr
* Vocabulary Reference: http://purl.org/goodrelations/v1
* Developer's Wiki: http://www.ebusiness-unibw.org/wiki/GoodRelations
* Examples: http://bit.ly/cookbook4gr
* Presentations: http://bit.ly/grtalks
* Videos: http://bit.ly/grvideos
Received on Thursday, 7 October 2010 18:58:48 UTC

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