So if this "hidden div / span" approach is not feasible, we got a problem.
The reason is that, as beautiful the idea is of using RDFa to make a)
the human-readable presentation and b) the machine-readable meta-data
link to the same literals, the problematic is it in reality once the
structure of a) and b) are very different.
For very simple property-value pairs, embedding RDFa markup is no
problem. But if you have a bit more complexity at the conceptual level
and in particular if there are significant differences to the structure
of the presentation (e.g. in terms of granularity, ordering of elements,
etc.), it gets very, very messy and hard to maintain.
And you give up the clear separation of concerns between the conceptual
level and the presentation level that XML brought about.
Maybe one should tell Google that this is not cloaking if SW meta-data
is embedded...
But the snippet basically indicates that we should not recommend this
practice.
Martin
Kingsley Idehen wrote:
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/Mark,
Time to make a sample RDFa doc that includes very detailed GR based
metadata.
Mark: Should we be describing our docs for Google, fundamentally? I
really think Google should actually recalibrate back to the Web etc..
--
--------------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen
e-mail: [email protected]
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
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tel;work:+49 89 6004 4217
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