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an introduction to rdfa by mark birbeck
rdfa originates in work done on xhtml 2, but can be used in mark-up today
we need to unlock the metadata already in web-pages, as well as encourage people to add more
rdfa provides a generic way to do this by building on features already in html
<meta name=&quot; author &quot;content=&quot; Mark Birbeck &quot; /> <link rel=&quot; license &quot;  href=&quot; http://creativecommons.org/licenses/by/2.0/ &quot; />
<img src=&quot; http://farm1.static.flickr.com/...jpg &quot;  /> Zakim Bridge by Paul Keleher <a   rel=&quot;license&quot;  href=&quot;http://creativecommons.org/licenses/by/2.0/&quot;>  ... </a>
<img src=&quot; http://farm1.static.flickr.com/...jpg &quot;  /> Zakim Bridge by Paul Keleher <a  about =&quot; http://farm1.static.flickr.com/...jpg &quot;   rel=&quot;license&quot;  href=&quot;http://creativecommons.org/licenses/by/2.0/&quot;>  ... </a>
Boston Harbor by Paul Keleher <span   about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of   <span  property=&quot;title&quot; > Boston Harbor </span> </span> <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of  <span  property=&quot;title&quot; > Boston Harbor </span>  taken by  <span  property=&quot;creator&quot; > Paul </span>. </span>
<span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of  <span  property=&quot;title&quot; > Boston Harbor </span>  taken by  <span  property=&quot;creator&quot; content=&quot;Paul Keleher&quot; >   Paul   </span>. </span> Boston Harbor by Paul Keleher
Christmas Lights by Paul Keleher <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of  <span  property=&quot;title&quot; > Christmas Lights </span>  taken on  <span  property=&quot;created&quot; > December 1st </span>. </span> <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of  <span  property=&quot;title&quot; > Christmas Lights </span>  taken on  <span  property=&quot;created&quot; content=&quot;2007-12-01&quot; >   December 1st   </span>. </span>
Christmas Lights by Paul Keleher <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  A picture of  <span  property=&quot;title&quot; > Christmas Lights </span>  taken on  <span  property=&quot;created&quot; content=&quot;2007-12-01&quot;   datatype=&quot;xs:date&quot; >   December 1st   </span>. </span>
Spiral Staircase by Paul Keleher <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  <span  property=&quot;title&quot; > Spiral Staircases </span>  taken by  <span  property=&quot;creator&quot; > Paul Keleher </span>.  <span  property=&quot;geo:lat&quot; content=&quot;42.359188&quot;  / >   <span  property=&quot;geo:long&quot; content=&quot;-71.058291&quot;  /> </span>
Spiral Staircase by Paul Keleher <span  about=&quot;http://farm1.static.flickr.com/...jpg&quot; >  <span  property=&quot; geo:lat &quot; content=&quot; 42.359188 &quot;   / >   <span  property=&quot; geo:long &quot; content=&quot; -71.058291 &quot;   /> </span>
<span  about=&quot;http://www.w3.org/People/Ivan/#me&quot; >  <span   property=&quot;foaf:name&quot; > Ivan Herman </span>  knows  Mark Birbeck  and they are meeting today. </span>
<span  about=&quot;http://www.w3.org/People/Ivan/#me&quot;   instanceof=&quot;foaf:Person&quot; >  <span  property=&quot;foaf:name&quot; > Ivan Herman </span>  knows  Mark Birbeck  and they are meeting today. </span>
<div  about=&quot;urn:ISBN:0091808189&quot;   instanceof=&quot;bib:book&quot; >   A book. </div> <div  about=&quot;urn:ISBN:1596913614&quot;   instanceof=&quot;bib:book&quot; >   A book. </div>
<span  about=&quot;http://www.w3.org/People/Ivan/#me&quot; >  <span  property=&quot;foaf:name&quot; > Ivan Herman </span>  knows  <span   rel=&quot;foaf:knows&quot;   resource=&quot;http://inter...blo.com/profile.html#&quot;   >   Mark Birbeck   </span>  and they are meeting today. </span>
<div  rel=&quot;foaf:holdsAccount&quot; >   <span  instanceof=&quot;foaf:OnlineAccount&quot; >   <span  rel=&quot;foaf:accountServiceHomepage&quot;   resource=&quot;http://www.twitter.com/&quot;   >   Twitter Name:   </span>   <span  property=&quot;foaf:accountName&quot; > markbirbeck </span>   </span> </div>
summary about:  determines what we're talking about property  and  content:  set text values datatype:  sets the type of a text value instanceof : sets the type of something resource:  same as  href , but not clickable rel  and  rev:  had before, but now work with  src
rdfa is basically microformat’s big brother daniel e. renfer rdfa is microformats done right bob ducharme
more information rdfa.info:  http://rdfa.info my blog:  http://internet-apps.blogspot.com software:  http://www.swcube.com in detail:  http://www.swcube.com/rdfa

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The 5 minute guide to RDFa...in only 6 minutes 40 seconds

  • 1. an introduction to rdfa by mark birbeck
  • 2. rdfa originates in work done on xhtml 2, but can be used in mark-up today
  • 3. we need to unlock the metadata already in web-pages, as well as encourage people to add more
  • 4. rdfa provides a generic way to do this by building on features already in html
  • 5. <meta name=&quot; author &quot;content=&quot; Mark Birbeck &quot; /> <link rel=&quot; license &quot; href=&quot; http://creativecommons.org/licenses/by/2.0/ &quot; />
  • 6. <img src=&quot; http://farm1.static.flickr.com/...jpg &quot; /> Zakim Bridge by Paul Keleher <a rel=&quot;license&quot; href=&quot;http://creativecommons.org/licenses/by/2.0/&quot;> ... </a>
  • 7. <img src=&quot; http://farm1.static.flickr.com/...jpg &quot; /> Zakim Bridge by Paul Keleher <a about =&quot; http://farm1.static.flickr.com/...jpg &quot; rel=&quot;license&quot; href=&quot;http://creativecommons.org/licenses/by/2.0/&quot;> ... </a>
  • 8. Boston Harbor by Paul Keleher <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Boston Harbor </span> </span> <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Boston Harbor </span> taken by <span property=&quot;creator&quot; > Paul </span>. </span>
  • 9. <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Boston Harbor </span> taken by <span property=&quot;creator&quot; content=&quot;Paul Keleher&quot; > Paul </span>. </span> Boston Harbor by Paul Keleher
  • 10. Christmas Lights by Paul Keleher <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Christmas Lights </span> taken on <span property=&quot;created&quot; > December 1st </span>. </span> <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Christmas Lights </span> taken on <span property=&quot;created&quot; content=&quot;2007-12-01&quot; > December 1st </span>. </span>
  • 11. Christmas Lights by Paul Keleher <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > A picture of <span property=&quot;title&quot; > Christmas Lights </span> taken on <span property=&quot;created&quot; content=&quot;2007-12-01&quot; datatype=&quot;xs:date&quot; > December 1st </span>. </span>
  • 12. Spiral Staircase by Paul Keleher <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > <span property=&quot;title&quot; > Spiral Staircases </span> taken by <span property=&quot;creator&quot; > Paul Keleher </span>. <span property=&quot;geo:lat&quot; content=&quot;42.359188&quot; / > <span property=&quot;geo:long&quot; content=&quot;-71.058291&quot; /> </span>
  • 13. Spiral Staircase by Paul Keleher <span about=&quot;http://farm1.static.flickr.com/...jpg&quot; > <span property=&quot; geo:lat &quot; content=&quot; 42.359188 &quot; / > <span property=&quot; geo:long &quot; content=&quot; -71.058291 &quot; /> </span>
  • 14. <span about=&quot;http://www.w3.org/People/Ivan/#me&quot; > <span property=&quot;foaf:name&quot; > Ivan Herman </span> knows Mark Birbeck and they are meeting today. </span>
  • 15. <span about=&quot;http://www.w3.org/People/Ivan/#me&quot; instanceof=&quot;foaf:Person&quot; > <span property=&quot;foaf:name&quot; > Ivan Herman </span> knows Mark Birbeck and they are meeting today. </span>
  • 16. <div about=&quot;urn:ISBN:0091808189&quot; instanceof=&quot;bib:book&quot; > A book. </div> <div about=&quot;urn:ISBN:1596913614&quot; instanceof=&quot;bib:book&quot; > A book. </div>
  • 17. <span about=&quot;http://www.w3.org/People/Ivan/#me&quot; > <span property=&quot;foaf:name&quot; > Ivan Herman </span> knows <span rel=&quot;foaf:knows&quot; resource=&quot;http://inter...blo.com/profile.html#&quot; > Mark Birbeck </span> and they are meeting today. </span>
  • 18. <div rel=&quot;foaf:holdsAccount&quot; > <span instanceof=&quot;foaf:OnlineAccount&quot; > <span rel=&quot;foaf:accountServiceHomepage&quot; resource=&quot;http://www.twitter.com/&quot; > Twitter Name: </span> <span property=&quot;foaf:accountName&quot; > markbirbeck </span> </span> </div>
  • 19. summary about: determines what we're talking about property and content: set text values datatype: sets the type of a text value instanceof : sets the type of something resource: same as href , but not clickable rel and rev: had before, but now work with src
  • 20. rdfa is basically microformat’s big brother daniel e. renfer rdfa is microformats done right bob ducharme
  • 21. more information rdfa.info: http://rdfa.info my blog: http://internet-apps.blogspot.com software: http://www.swcube.com in detail: http://www.swcube.com/rdfa

Editor's Notes

  1. Putting clearer metadata into web-pages would help the search engines, as well as improve the user experience.