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Why RDFa? Presentation I'm giving at SWNYC Meetup today (11/20/2008).
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Why RDFa?Why RDFa?
Sergey Chernyshev
some slides fromYaron Koren’s “Introduction to RDFa”
SWNYC MeetupNovember 20th, 2008
http://www.techpresentations.org/Why_RDFa?
StatusStatus
W3C recommendation since October 14, 2008: W3C recommendation since October 14, 2008: http://www.w3.org/TR/rdfa-syntax/http://www.w3.org/TR/rdfa-syntax/
First proposed in 2004First proposed in 2004
How RDFa worksHow RDFa works
Joe Semantic's personal informationJoe Semantic's personal information
I work as a programmer at I work as a programmer at MegaCorpMegaCorp - you - you can contact me at can contact me at [email protected]@megacorp.com, or by , or by phone at (101) 010-1010. phone at (101) 010-1010.
HTML sourceHTML source<html><html>
<head><head>
<title>Joe Programmer's contact info</title><title>Joe Programmer's contact info</title>
<base href="http://joeprogrammer.com/contact-info.html" /><base href="http://joeprogrammer.com/contact-info.html" />
</head></head>
<body><body>
<h1>Joe Semantic's personal information</h1><h1>Joe Semantic's personal information</h1>
<p>I work as a programmer at<p>I work as a programmer at
<a href="http://megacorp.com">MegaCorp</a> -<a href="http://megacorp.com">MegaCorp</a> -
you can contact me atyou can contact me at
<a href="mailto:[email protected]">[email protected]</a>,<a href="mailto:[email protected]">[email protected]</a>,
or by phone at (101)010-1010.</p>or by phone at (101)010-1010.</p>
</body></body>
</html></html>
RDF / XMLRDF / XML
<?xml version="1.0" encoding="UTF-8"?><?xml version="1.0" encoding="UTF-8"?><rdf:RDF xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#"><rdf:RDF xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#"> <rdf:Description rdf:about="http://joesemantic.com/contact-info.html"><rdf:Description rdf:about="http://joesemantic.com/contact-info.html"> <contact:title xml:lang="en">programmer</contact:title><contact:title xml:lang="en">programmer</contact:title> <contact:org rdf:resource="http://megacorp.com"/><contact:org rdf:resource="http://megacorp.com"/> <contact:email rdf:resource="[email protected]"/><contact:email rdf:resource="[email protected]"/> <contact:tel xml:lang="en">(101) 010-1010</contact:tel><contact:tel xml:lang="en">(101) 010-1010</contact:tel> </rdf:Description></rdf:Description></rdf:RDF></rdf:RDF>
Why not combine the two?Why not combine the two?
<html <html xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#"xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#">> <head><head> <title>Joe Semantic's personal information</title><title>Joe Semantic's personal information</title> <base href="http://joesemantic.com/contact-info.html" /><base href="http://joesemantic.com/contact-info.html" /> </head></head> <body><body> <h1>Joe Semantic's personal information</h1><h1>Joe Semantic's personal information</h1> <p>I work as a <p>I work as a
<span property=”contact:title”>programmer</span><span property=”contact:title”>programmer</span>atat<a rel="contact:org“ href="http://megacorp.com"><a rel="contact:org“ href="http://megacorp.com">MegaCorpMegaCorp</a></a>- you can contact me at- you can contact me at<a rel="contact:email“ href="mailto:[email protected]"><a rel="contact:email“ href="mailto:[email protected]">
[email protected]@megacorp.com</a></a>, or by phone at, or by phone at<span property=”contact:tel”>(101)010-1010</span><span property=”contact:tel”>(101)010-1010</span>..
</p></p> </body></body></html></html>
Three main keywords in RDFaThree main keywords in RDFa
<a <a relrel=”=”predicatepredicate” href=”” href=”objectobject”>...</a>”>...</a>
...defines a linked triple...defines a linked triple
<span <span propertyproperty=”=”predicatepredicate”>”>objectobject</span></span>
...defines an unlinked triple (literal)...defines an unlinked triple (literal)
<span <span aboutabout=”=”subjectsubject”>...</span>”>...</span>
...creates a subject for triples...creates a subject for triples
Creating subjectsCreating subjects......
I'm currently readingI'm currently reading
<span about=”urn:ISBN:0-596-00027-8”><span about=”urn:ISBN:0-596-00027-8”>
<span property="dc:title">Programming Perl</span><span property="dc:title">Programming Perl</span>
byby
<span property="dc:creator">Larry Wall</span><span property="dc:creator">Larry Wall</span>
</span></span>..
......
Easier to produceEasier to produce
Much easier then RDF/XML or N-triplesMuch easier then RDF/XML or N-triples
Almost as easy as Almost as easy as Microformats
Easy to integrate with existing publishing tools – just change your HTML templates
Easy to useEasy to use
Probably first to be adopted by conventional search engines because they already crawl HTML(Yahoo! Search Monkey)
Can be used with JavaScript (http://www.w3.org/2006/07/SWD/RDFa/impl/js/)
Easy to integrate into current “web page” paradigm and workflow(CC license link at http://ben.adida.net/)
LinksLinks
RDFa.infoRDFa.infohttp://rdfa.info/http://rdfa.info/
RDFa primerRDFa primerhttp://www.w3.org/TR/xhtml-rdfa-primer/http://www.w3.org/TR/xhtml-rdfa-primer/
Yahoo! Search Monkeyhttp://developer.yahoo.com/searchmonkey
[*shameless plug*][*shameless plug*] My Semantic Profile My Semantic Profilehttp://www.sergeychernyshev.com/profile/http://www.sergeychernyshev.com/profile/
