- From: Melvin Carvalho <melvincarvalho@gmail.com>
- Date: Sat, 27 Jun 2009 12:25:18 +0200
- To: martin.hepp@ebusiness-unibw.org
- Cc: Kingsley Idehen <kidehen@openlinksw.com>, Mark Birbeck <mark.birbeck@webbackplane.com>, public-lod@w3.org, semantic-web at W3C <semantic-web@w3c.org>
On Sat, Jun 27, 2009 at 9:21 AM, Martin Hepp (UniBW)<martin.hepp@ebusiness-unibw.org> wrote: > 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. What happens if you put them in one big <span> tree and use the @content attribute? > > 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: 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 Saturday, 27 June 2009 10:25:53 UTC