Why RDFa?

Why RDFa? Sergey Chernyshev some slides from Yaron Koren’s “ Introduction to RDFa ” SWNYC Meetup November 20 th , 2008 http:// www.techpresentations.org/Why_RDFa ?

Status
W3C recommendation since October 14, 2008: http://www.w3.org/TR/rdfa-syntax/
First proposed in 2004

How RDFa works Joe Semantic's personal information I work as a programmer at MegaCorp - you can contact me at [email_address] , or by phone at (101) 010-1010.

HTML source <html> <head> <title>Joe Programmer's contact info</title> <base href="http://joeprogrammer.com/contact-info.html" /> </head> <body> <h1>Joe Semantic's personal information</h1> <p>I work as a programmer at <a href="http://megacorp.com">MegaCorp</a> - you can contact me at <a href="mailto:js@megacorp.com">js@megacorp.com</a>, or by phone at (101)010-1010.</p> </body> </html>

RDF / XML <?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#"> <rdf:Description rdf:about="http://joesemantic.com/contact-info.html"> <contact:title xml:lang="en">programmer</contact:title> <contact:org rdf:resource="http://megacorp.com"/> <contact:email rdf:resource="js@megacorp.com"/> <contact:tel xml:lang="en">(101) 010-1010</contact:tel> </rdf:Description> </rdf:RDF>

Why not combine the two?

<html xmlns:contact="http://www.w3.org/2001/vcard-rdf/3.0#" > <head> <title>Joe Semantic's personal information</title> <base href="http://joesemantic.com/contact-info.html" /> </head> <body> <h1>Joe Semantic's personal information</h1> <p>I work as a <span property=”contact:title”>programmer</span> at <a rel="contact:org“ href="http://megacorp.com"> MegaCorp </a> - you can contact me at <a rel="contact:email“ href="mailto:js@megacorp.com"> [email_address] </a> , or by phone at <span property=”contact:tel”>(101)010-1010</span> . </p> </body> </html>

Three main keywords in RDFa <a rel =” predicate ” href=” object ”>...</a> ...defines a linked triple <span property =” predicate ”> object </span> ...defines an unlinked triple (literal) <span about =” subject ”>...</span> ...creates a subject for triples

Creating subjects ... I'm currently reading <span about=”urn:ISBN:0-596-00027-8”> <span property="dc:title">Programming Perl</span> by <span property="dc:creator">Larry Wall</span> </span> . ...

Easier to produce
Much easier then RDF/XML or N-triples
Almost as easy as Microformats
Easy to integrate with existing publishing tools – just change your HTML templates

Easy 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 / )

Links
RDFa.info http://rdfa.info/
RDFa primer http://www.w3.org/TR/xhtml-rdfa-primer/
Yahoo! Search Monkey http:// developer.yahoo.com/searchmonkey
[*shameless plug*] My Semantic Profile http:// www.sergeychernyshev.com /profile/

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Why RDFa?

by Sergey Chernyshev

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