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/RDFaAuthoringBest 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.
>
>
>
>
>
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>
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>
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>
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>
--
--------------------------------------------------------------
martin hepp
e-business& web science research group
universitaet der bundeswehr muenchen
e-mail:
hepp at ebusiness-unibw.orgphone: +49-(0)89-6004-4217
fax: +49-(0)89-6004-4620
www:
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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/GoodRelationsWebcasts:
Overview -
http://www.heppnetz.de/projects/goodrelations/webcast/How-to -
http://vimeo.com/7583816Recipe for Yahoo SearchMonkey:
http://www.ebusiness-unibw.org/wiki/GoodRelations_and_Yahoo_SearchMonkeyTalk 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-1535287Overview article on Semantic Universe:
http://www.semanticuniverse.com/articles-semantic-web-based-e-commerce-webmasters-get-ready.htmlTutorial 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
