1. WTF is the Semantic Web Juan F. Sequeda Semantic Web Austin Oct 1, 2011

2. WTF is the Semantic Web?

3. Internet != Web

5. What is the Web? “… the Web, is a system of interlinked hypertext documents accessed via the Internet. With a web browser, one can view web pages that may contain text, images […] and navigate between them via hyperlinks” http://en.wikipedia.org/wiki/World_Wide_Web

6. Current Web = internet + links + docs

7. History of the Web Created by Tim Berners-Lee at CERN in 1989 Mosaic browser in 1993 W3C created in 1994 Exponential growth mid 90s Amazon, Ebay – 1995 Search engines – Google 1998 Dot-com boom 1997 – 2001 Web 2.0 – blogs, Facebook, Twitter, etc

8. What is the problem?

9. WHAT’S THE WEATHER IN AUSTIN TODAY? http://www.flickr.com/photos/jamieca/31631256/

13. What is the problem? The web is full of documents We aren’t always interested in documents We are interested in THINGS These THINGS might be in documents We can read a HTML document rendered in a browser and find what we are searching for This is hard for computers. Computers have to guess (even though they are pretty good at it)

14. The Web is a Data Shredder Structured Data Unstructured Data Thanks Martin Hepp

15. What would we like? Make it easy for computers/software to find THINGS Do you SEARCH or do you FIND?

16. Search for Football Players who went to the University of Texas at Austin, played for the Dallas Cowboys as Cornerback

20. Why can’t we just FIND it…

23. Guess how I FOUND out?

24. On a Semantic Web Besides publishing documents on the web which computers can’t understand easily Let’s publish on the web something that computers can understand DATA

25. The Semantic Web is aweb of data The current web is a web of documents

26. But wait… doesn’t the web already have data?

27. Current Data on the Web Relational Databases APIs XML CSV XLS … Can’t computers and applications already consume that data on the web?

28. Yes! But it is all in different formats and data models!

29. This makes it hard to integrate data

30. The data in different data sources aren’t linked

31. For example, how do I know that the Juan Sequeda in Facebook is the same as Juan Sequeda in Twitter

32. Or if I create a mashup from different services, I have to learn different APIs and I get different formats of data back

33. Data is Siloed

34. Wouldn’t it be great if we had a standard way of publishing data on the Web?

35. We have a standardized way of publishing documents on the web, right? HTML

36. Then why can’t we have a standard way of publishing data on the Web?

37. Good question! And the answer is YES. There is! RDF

38. Resource Description Framework (RDF) Data Model = a way to model data i.e. Relational databases use relational data model RDF is a graph data model

39. Key Value vs Graph Key Values firstName Juan lastName Sequeda livesIn Austin knows StephaneCorlosquet But what are these key/values describing? ME!

40. RDF is a Graph Let’s group the Key/Values together <JuanSequeda> <firstName> “Juan” <JuanSequeda> <lastName> “Sequeda” <JuanSequeda> <livesIn> “Austin” <JuanSequeda> <knows> <StephaneCorlosquet> .. <StephaneCorlosquet> <firstName> “Stephane” <StephaneCorlosquet> <lastName> “Corlosquet” <StephaneCorlosquet> <livesIn> “Boston”

41. RDF is a Graph Let’s group the Key/Values together <JuanSequeda> <firstName> “Juan” <JuanSequeda> <lastName> “Sequeda” <JuanSequeda> <livesIn> “Austin” <JuanSequeda> <knows> <StephaneCorlosquet> .. <StephaneCorlosquet> <firstName> “Stephane” <StephaneCorlosquet> <lastName> “Corlosquet” <StephaneCorlosquet> <livesIn> “Boston” Identifier for the “group” Key/Value

42. RDF can be serialized in different ways RDF/XML RDFa (RDF in HTML) N3 Turtle JSON

44. RDFa

45. RDF/XML

46. RDF/N-triples

47. RDF/Turtle

48. So does that mean that I have to publish my data in RDF now?

49. You don’t have to… but we would like you to  Schema.org Rich Snippets …

50. An example

51. Document on the Web

52. Databases back up documents THINGS have PROPERTIES: A Book as a Title, an author, … This is a THING: A book title “Programming the Semantic Web” by Toby Segaran, …

53. Lets represent the data in RDF Programming the Semantic Web title author book Toby Segaran isbn 978-0-596-15381-6 publisher name Publisher O’Reilly

54. Remember that we are on the web Everything on the web is identified by a URI

55. And now let’s link the data to other data Programming the Semantic Web title author http://…/isbn978 Toby Segaran isbn 978-0-596-15381-6 publisher name http://…/publisher1 O’Reilly

56. And now consider the data from Revyu.com hasReview http://…/review1 http://…/isbn978 description reviewer Awesome Book http://…/reviewer name Juan Sequeda

57. Let’s start to link data hasReview http://…/review1 http://…/isbn978 Programming the Semantic Web title description sameAs hasReviewer Awesome Book author http://…/isbn978 Toby Segaran http://…/reviewer name isbn 978-0-596-15381-6 Juan Sequeda publisher name http://…/publisher1 O’Reilly

58. Juan Sequeda publishes data too http://juansequeda.com/id http://dbpedia.org/Austin livesIn name Juan Sequeda

59. Let’s link more data hasReview http://…/review1 http://…/isbn978 description hasReviewer Awesome Book http://…/reviewer name Juan Sequeda sameAs http://juansequeda.com/id http://dbpedia.org/Austin livesIn name Juan Sequeda

60. And more hasReview http://…/review1 http://…/isbn978 Programming the Semantic Web title description sameAs hasReviewer Awesome Book author http://…/isbn978 Toby Segaran http://…/reviewer name isbn 978-0-596-15381-6 Juan Sequeda publisher sameAs http://…/publisher1 name O’Reilly http://juansequeda.com/id http://dbpedia.org/Austin livesIn name Juan Sequeda

61. Data on the Web that is in RDF and is linked to other RDF data isLINKED DATA

62. Linked Data Principles Use URIs as names for things Use HTTP URIs so that people can look up (dereference) those names. When someone looks up a URI, provide useful information. Include links to other URIs so that they can discover more things.

63. Linked Data makes the web appear as ONEGIANTHUGEGLOBALDATABASE!

64. I can query a database with SQL. Is there a way to query Linked Data with a query language?

65. Yes! There is actually a standardize language for that SPARQL

66. FIND all the reviews on the book “Programming the Semantic Web” by people who live in Austin

67. SELECT ?review ?comment WHERE { isbn:978 ex:hasReview ?review . ?review ex:description ?comment . ?review ex:hasReviewer ?person . ?person ex:livesdbpedia:Austin . } SPARQL

68. SELECT ?review ?comment WHERE { isbn:978 ex:hasReview ?review . ?review ex:description ?comment . ?review ex:hasReviewer ?person . ?person ex:livesdbpedia:Austin . } hasReview http://…/review1 http://…/isbn978 Programming the Semantic Web title description sameAs hasReviewer Awesome Book author http://…/isbn978 Toby Segaran http://…/reviewer name isbn 978-0-596-15381-6 Juan Sequeda publisher sameAs name http://…/publisher1 O’Reilly http://juansequeda.com http://dbpedia.org/Austin livesIn name Juan Sequeda

69. This looks cool, but let’s be realistic. What is the incentive to publish Linked Data?

70. What was your incentive to publish an HTML page in 1990?

71. 1) Share data in documents2) Because you neighbor was doing it… later on …3) Marketing, Advertising, …, SEO

72. So why should we publish Linked Data in 2011?

73. 1) Share data as data2) Because you neighbor is doing it…3) Marketing, Advertising, SEO ++

74. Linked Data Publishers UK Government US Government BBC Open Calais – Thomson Reuters Freebase/Google NY Times Best Buy Sears Kmart Overstock.com CNET Dbpedia O’Reilly Media …

75. May 2007

76. Oct 2007

77. Nov 2007

78. Feb 2008

79. Mar 2008

80. Sept 2008

81. Mar 2009 (1)

82. Mar 2009 (2)

83. July 2009

84. September 2010

85. September 2011 Linking Open Data cloud diagram, by Richard Cyganiak and AnjaJentzsch. http://lod-cloud.net/

86. YOU GET THE PICTURE ITS BIG and getting BIGGER and BIGGER

87. QUESTIONS?