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Re: .htaccess a major bottleneck to Semantic Web adoption / Was: Re: RDFa vs RDF/XML and content negotiation

From: Roberto García <rogargon@gmail.com>
Date: Thu, 9 Jul 2009 02:09:10 +0100
Message-ID: <e56f135c0907081809w792e7b51i858580f570d6f915@mail.gmail.com>
To: martin.hepp@ebusiness-unibw.org
Cc: public-lod@w3.org, semantic-web at W3C <semantic-web@w3c.org>
Hi Martin, all,

I would like to point to something that might be useful for RDF data
publishing. The ReDeFer RDF2HTML service
(http://rhizomik.net/redefer/) renders input RDF/XML data as HTML for
user interaction (e.g. as used in http://rhizomik.net/rhizomer/). Now,
it also embeds RDFa that facilitates retrieving the source RDF back.

I've tested it with a pair of GoodRelations examples:

I've been able to check that it works for these examples by comparing
the triples generated by RDFa Distiller and RDFa Bookmarklet from the
previous HTML+RDFa pages to those generated by any23 and Triplr from
the original OWL files.

The generated HTML+RDFa can be then used in order to publish RDF just
by Cut&Paste, e.g. using an online editor like FCKEditor. This has
been the procedure followed in order to publish the RDF in

The HTML+RDFa view might be customised using CSS and made more usable
if the source RDF contains rdfs:labels for the involved resources,
which are used instead of the last part of the URIs if available.

In any case, if it is no to be shown to the user, it is easier to just
model triples using hidden <spans> instead of using this service...

Best regards,

Roberto García

PD: Caution, this is work in progress. Feedback appreciated :-)

On Wed, Jul 8, 2009 at 12:59 PM, Martin Hepp
(UniBW)<martin.hepp@ebusiness-unibw.org> wrote:
> Google has just changed the wording of the documentation:
> http://knol.google.com/k/google-rich-snippets/google-rich-snippets/32la2chf8l79m/1#
> The mentioning of cloaking risk is removed. While this is not final
> clearance,
> it is a nice sign that our concerns are heard.
> Best
> Martin
> Martin Hepp (UniBW) wrote:
>> Dear all:
>> Fyi - I am in contact with Google as for the clarification of what kind of
>> empty div/span elements are considered acceptable in the context of RDFa. It
>> may take a few days to get an official statement. Just so that you know it
>> is being taken care of...
>> Martin
>> Mark Birbeck wrote:
>>> Hi Martin,
>>>> b) download RDFa snippet that just represents the RDF/XML content (i.e.
>>>> such
>>>> that it does not have to be consolidated with the "presentation level"
>>>> part
>>>> of the Web page.
>>> By coincidence, I just read this:
>>>  Hidden div's -- don't do it!
>>>  It can be tempting to add all the content relevant for a rich snippet
>>>  in one place on the page, mark it up, and then hide the entire block
>>>  of text using CSS or other techniques. Don't do this! Mark up the
>>>  content where it already exists. Google will not show content from
>>>  hidden div's in Rich Snippets, and worse, this can be considered
>>>  cloaking by Google's spam detection systems. [1]
>>> Regards,
>>> Mark
>>> [1]
>>> <http://knol.google.com/k/google-rich-snippets/google-rich-snippets/32la2chf8l79m/1#>
> --
> --------------------------------------------------------------
> martin hepp
> e-business & web science research group
> universitaet der bundeswehr muenchen
> e-mail:  mhepp@computer.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 the GoodRelations vocabulary for E-Commerce on the Web of Data!
> ========================================================================
> Webcast:
> http://www.heppnetz.de/projects/goodrelations/webcast/
> Talk at the Semantic Technology Conference 2009: "Semantic Web-based
> E-Commerce: The GoodRelations Ontology"
> http://tinyurl.com/semtech-hepp
> Tool for registering your business:
> http://www.ebusiness-unibw.org/tools/goodrelations-annotator/
> Overview article on Semantic Universe:
> http://tinyurl.com/goodrelations-universe
> Project page and resources for developers:
> http://purl.org/goodrelations/
> Tutorial materials:
> Tutorial at ESWC 2009: The Web of Data for E-Commerce in One Day: A Hands-on
> Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey
> http://www.ebusiness-unibw.org/wiki/GoodRelations_Tutorial_ESWC2009
Received on Thursday, 9 July 2009 01:09:55 UTC

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