- From: Kingsley Idehen <kidehen@openlinksw.com>
- Date: Sat, 27 Jun 2009 10:16:00 -0400
- To: martin.hepp@ebusiness-unibw.org
- CC: Mark Birbeck <mark.birbeck@webbackplane.com>, public-lod@w3.org, semantic-web at W3C <semantic-web@w3c.org>
Martin Hepp (UniBW) 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... Yes. Ideally, they should figure that out from the self-describing nature of the RDF based metadata exposed by the embedded RDFa -- assuming they are doing real RDFa processing :-) Kingsley > > 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.. >> >> > -- Regards, Kingsley Idehen Weblog: http://www.openlinksw.com/blog/~kidehen President & CEO OpenLink Software Web: http://www.openlinksw.com
Received on Saturday, 27 June 2009 14:16:40 UTC