This is the archive of the goodrelations dicussion list

Hi Andrés,
thanks for your post.

1. In general, I would suggest to use relative URIs for the "about" 
attribute so that the final element will have a hash URI reference that 
point to the page containing the markup, rather than to an external page.

So in a page at someblog.com, you should rather have

<div typeof="sioc:Post" about="#post>

than

<div typeof="sioc:Post" about="http://myindex.com#post>

Otherwise, someone trying to look up the definition for ...#post from 
the "semantic web" data will be directed to "http://myindex.com", which 
does not contain that markup.

Note that "about" in RDFa does not define the topic of the post, but teh 
URI to associate with the current HTML element.So @ someblog.com/ we 
have something like the following:
> This is some content related to the product.
> It also includes a<span typeof="gr:Offering" about="
> http://myindex.com#offer"><a rel="foaf:page"
> href="http://somestore.com">special
> discount offer</a></span>  of the product.
> </span>
> <span rel="sioc:about" resource="
> http://www.savingsocrates.com/market/atrapalocl_12#offer"></span>
> </div>
>
>    
At first view, that looks okay.
> @ myindex.com, something like this:
> (xml name spaces are not shown)
>
> <div typeof="gr:Offering" about="#offer">
>      (some gr markup)
>      <a rel="foaf:page" href="http://somestore.com">Buy it here!</a>
> </div>
>
>    
At first view, that looks okay.
> @ somestore.com, plain and simple: no RDFa markup, just buy the product.
>    
I would also put RDFa for the offer into the somestore pages.

As for authoring (and debugging) such markup, I suggest:

1. Use the Turtle RDF syntax for modeling the data.
2. Convert Turtle to RDF/XML with 
http://www.rdfabout.com/demo/validator/ 
<http://www.rdfabout.com/demo/validator/>
3. Convert resulting RDF/XML to RDFa snippet with 
http://www.ebusiness-unibw.org/tools/rdf2rdfa/

For checking whether your markup is correct, use the PyRDFa extractor 
and check the resulting RDF in Turtle syntax:

http://www.w3.org/2007/08/pyRdfa/

Also see

http://www.ebusiness-unibw.org/wiki/RDFaAuthoring

Best wishes

Martin Hepp
> I already checked out quite some of the GR recipes, as well as the recent
> updates. My main concern is to get relation between URIs correctly, really.
> Am I making the correct connections between the 3 different URLs?
> Also, I tried out myindex.com with google's Rich Snippet preview tool, and
> it only works with reviews and location markup. I'm sure it should be a
> problem with my syntaxis, though.
>
>
> Hope this raises some debate :D. Hope I was clear enough, too.
>
> Andrés
>
> ps. If you recognize my last name, I'm Aldo's evil marketing twin.
>
>    
>
>
> _______________________________________________
> goodrelations mailing list
> goodrelations at ebusiness-unibw.org
> http://ebusiness-unibw.org/cgi-bin/mailman/listinfo/goodrelations
>    

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

e-mail:  hepp at 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 page:
http://purl.org/goodrelations/

Resources for developers:
http://www.ebusiness-unibw.org/wiki/GoodRelations

Webcasts:
Overview - http://www.heppnetz.de/projects/goodrelations/webcast/
How-to   - http://vimeo.com/7583816

Recipe for Yahoo SearchMonkey:
http://www.ebusiness-unibw.org/wiki/GoodRelations_and_Yahoo_SearchMonkey

Talk at the Semantic Technology Conference 2009:
"Semantic Web-based E-Commerce: The GoodRelations Ontology"
http://www.slideshare.net/mhepp/semantic-webbased-ecommerce-the-goodrelations-ontology-1535287

Overview article on Semantic Universe:
http://www.semanticuniverse.com/articles-semantic-web-based-e-commerce-webmasters-get-ready.html

Tutorial materials:
ISWC 2009 Tutorial: The Web of Data for E-Commerce in Brief: A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey
http://www.ebusiness-unibw.org/wiki/Web_of_Data_for_E-Commerce_Tutorial_ISWC2009