RDFa In A Nutshell V2

in a nutshell RDFa fabien, gandon, inria

many data buried and dormant in web pages 2

in particular data in the deep web 3

several initiatives to make data embedding explicit 4

for specific, common, concise data for custom data, RDF data, multiple schemas 5

RDFa = a domain-independent way to explicitly embed your data 6

RDFa = a domain-independent way to explicitly embed RDF data 7

RDFa stands for… RDF… in HTML … attributes 8

RDFa in attributes of a web page to… … transfer data from an application to another through the web. … write data only once for web users and web applications. 9

weaving RDFa in web pages 10

RDFa step 1 declare the schemas you are using 11

RDFa step 2 use attributes to mark, type and add data 12

RDFa step 3 let RDFa agents extract RDF from the document 13

take this minimal web page 14

don't look at the code of this web page <html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:cal=\"http://www.w3.org/2002/12/cal/icaltzd#\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema#\" > <body> Weekend off in Iona: 2006-10-21 to 2006-10-23 . see <a rel=\"cal:url\" href=\"http://freetime.example.org/\"> Free time web site</a> for info on Iona, UK. </body> </html> 15

schemas for data in this web page <html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:cal=\"http://www.w3.org/2002/12/cal/icaltzd#\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema#\" > <body> Weekend off in Iona: 2006-10-21 to 2006-10-23 . see <a rel=\"cal:url\" href=\"http://freetime.example.org/\"> Free time web site</a> for info on Iona, UK. </body> </html> 16

data seen by users viewing this web page <html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:cal=\"http://www.w3.org/2002/12/cal/icaltzd#\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema#\" > <body> Weekend off in Iona: 2006-10-21 to 2006-10-23 . see <a rel=\"cal:url\" href=\"http://freetime.example.org/\"> Free time web site</a> for info on Iona, UK. </body> </html> 17

data for an RDFa agent in this web page <html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:cal=\"http://www.w3.org/2002/12/cal/icaltzd#\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema#\" > <body> Weekend off in Iona: 2006-10-21 to 2006-10-23 . see <a rel=\"cal:url\" href=\"http://freetime.example.org/\"> Free time web site</a> for info on Iona, UK. </body> </html> 18

data shared by both in this web page <html xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:cal=\"http://www.w3.org/2002/12/cal/icaltzd#\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema#\" > <body> Weekend off in Iona: 2006-10-21 to 2006-10-23 . see <a rel=\"cal:url\" href=\"http://freetime.example.org/\"> Free time web site</a> for info on Iona, UK. </body> </html> 19

what an RDFa agent knows from this web page #event1 isA cal:Vevent #event1 cal:summary \"Weekend off in Iona\" #event1 cal:dtstart \"2006-10-21\"^^xs:date #event1 cal:dtend \"2006-10-23\"^^ xs:date #event1 cal:url <http://freetime.example.org/> #event1 cal:location \"Iona, UK\" 20

take away message 21

don't bury your data in some HTML page 22

when you publish a page that contains data… 23

do make the embedding explicit 24

fabien, gandon 25

RDFa In A Nutshell V2

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Notes on slide 1

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