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WTF is the Semantic Web
The document discusses the Semantic Web and linked data. It defines the current web as consisting of documents linked by hyperlinks that are readable by humans but difficult for computers to understand. The Semantic Web aims to publish structured data on the web using common standards like RDF so that data can be linked, queried, and integrated across sources. Key points include: - The Semantic Web uses RDF to represent data as a graph so that data from different sources can be linked together. - Linked data follows principles like using URIs to identify things and including links to other related data. - Query languages like SPARQL allow searching and integrating linked data from multiple sources. - There are now
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WTF is the Semantic Web
- 1. WTF is theSemantic WebJuan F. SequedaSemantic Web AustinOct 1, 2011
- 2. WTF is theSemantic Web?
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- 5. What is theWeb?“… 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 theWebCreated by Tim Berners-Lee at CERN in 1989Mosaic browser in 1993W3C created in 1994Exponential growth mid 90sAmazon, Ebay – 1995Search engines – Google 1998Dot-com boom 1997 – 2001Web 2.0 – blogs, Facebook, Twitter, etc
- 8. What is theproblem?
- 9. WHAT’S THE WEATHERIN AUSTIN TODAY?http://www.flickr.com/photos/jamieca/31631256/
- 13. What is theproblem?The web is full of documentsWe aren’t always interested in documentsWe are interested in THINGSThese THINGS might be in documentsWe can read a HTML document rendered in a browser and find what we are searching forThis is hard for computers. Computers have to guess (even though they are pretty good at it)
- 14. The Web isa Data ShredderStructured DataUnstructured DataThanks Martin Hepp
- 15. What would welike?Make it easy for computers/software to find THINGSDo you SEARCH or do you FIND?
- 16. Search forFootball Playerswho went to the University of Texas at Austin, played for the Dallas Cowboys as Cornerback
- 20. Why can’t wejust FIND it…
- 23. Guess how IFOUND out?
- 24. On a SemanticWebBesides publishing documents on the webwhich computers can’t understand easilyLet’s publish on the web something that computers can understandDATA
- 25. The Semantic Webis aweb of dataThe current web is aweb of documents
- 26. But wait… doesn’tthe web already have data?
- 27. Current Data onthe WebRelational DatabasesAPIsXMLCSVXLS…Can’t computers and applications already consume that data on the web?
- 28. Yes! But itis all in different formats and data models!
- 29. This makes ithard to integrate data
- 30. The data indifferent data sources aren’t linked
- 31. For example, howdo I know that the Juan Sequeda in Facebook is the same as Juan Sequeda in Twitter
- 32. Or if Icreate a mashup from different services, I have to learn different APIs and I get different formats of data back
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- 34. Wouldn’t it begreat if we had a standard way of publishing data on the Web?
- 35. We have astandardized way of publishing documents on the web, right?HTML
- 36. Then why can’twe have a standard way of publishing data on the Web?
- 37. Good question! Andthe answer is YES. There is!RDF
- 38. Resource Description Framework(RDF)Data Model = a way to model datai.e. Relational databases use relational data modelRDF is a graph data model
- 39. Key Value vsGraphKey ValuesfirstName JuanlastName SequedalivesIn Austinknows StephaneCorlosquetBut what are these key/values describing?ME!
- 40. RDF is aGraphLet’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 aGraphLet’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 beserialized in different waysRDF/XMLRDFa (RDF in HTML)N3TurtleJSON
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- 48. So does thatmean that I have to publish my data in RDF now?
- 49. You don’t haveto… but we would like you to Schema.orgRich Snippets…
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- 52. Databases back updocumentsTHINGS 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 thedata in RDFProgramming the Semantic WebtitleauthorbookToby Segaranisbn978-0-596-15381-6publishernamePublisherO’Reilly
- 54. Remember that weare on the webEverything on the web is identified by a URI
- 55. And now let’slink the data to other dataProgramming the Semantic Webtitleauthorhttp://…/isbn978Toby Segaranisbn978-0-596-15381-6publishernamehttp://…/publisher1O’Reilly
- 56. And now considerthe data from Revyu.comhasReviewhttp://…/review1http://…/isbn978descriptionreviewerAwesome Bookhttp://…/reviewernameJuan Sequeda
- 57. Let’s start tolink datahasReviewhttp://…/review1http://…/isbn978Programming the Semantic WebtitledescriptionsameAshasReviewerAwesome Bookauthorhttp://…/isbn978Toby Segaranhttp://…/reviewernameisbn978-0-596-15381-6Juan Sequedapublishernamehttp://…/publisher1O’Reilly
- 58. Juan Sequeda publishesdata toohttp://juansequeda.com/idhttp://dbpedia.org/AustinlivesInnameJuan Sequeda
- 59. Let’s link moredatahasReviewhttp://…/review1http://…/isbn978descriptionhasReviewerAwesome Bookhttp://…/reviewernameJuan SequedasameAshttp://juansequeda.com/idhttp://dbpedia.org/AustinlivesInnameJuan Sequeda
- 60. And morehasReviewhttp://…/review1http://…/isbn978Programming theSemantic WebtitledescriptionsameAshasReviewerAwesome Bookauthorhttp://…/isbn978Toby Segaranhttp://…/reviewernameisbn978-0-596-15381-6Juan SequedapublishersameAshttp://…/publisher1nameO’Reillyhttp://juansequeda.com/idhttp://dbpedia.org/AustinlivesInnameJuan Sequeda
- 61. Data on theWeb that is in RDF and is linked to other RDF data isLINKED DATA
- 62. Linked Data PrinciplesUseURIs as names for thingsUse 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 makesthe web appear as ONEGIANTHUGEGLOBALDATABASE!
- 64. I can querya database with SQL. Is there a way to query Linked Data with a query language?
- 65. Yes! There isactually a standardize language for thatSPARQL
- 66. FIND all thereviews on the book “Programming the Semantic Web” by people who live in Austin
- 67. SELECT ?review ?commentWHERE{ isbn:978 ex:hasReview ?review . ?review ex:description ?comment . ?review ex:hasReviewer ?person . ?person ex:livesdbpedia:Austin .} SPARQL
- 68. SELECT ?review ?commentWHERE{isbn:978 ex:hasReview ?review .?review ex:description ?comment .?review ex:hasReviewer ?person .?person ex:livesdbpedia:Austin .}hasReviewhttp://…/review1http://…/isbn978Programming the Semantic WebtitledescriptionsameAshasReviewerAwesome Bookauthorhttp://…/isbn978Toby Segaranhttp://…/reviewernameisbn978-0-596-15381-6Juan SequedapublishersameAsnamehttp://…/publisher1O’Reillyhttp://juansequeda.comhttp://dbpedia.org/AustinlivesInnameJuan Sequeda
- 69. This looks cool,but let’s be realistic. What is the incentive to publish Linked Data?
- 70. What was yourincentive to publish an HTML page in 1990?
- 71. 1) Share datain documents2) Because you neighbor was doing it… later on …3) Marketing, Advertising, …, SEO
- 72. So why shouldwe publish Linked Data in 2011?
- 73. 1) Share dataas data2) Because you neighbor is doing it…3) Marketing, Advertising, SEO ++
- 74. Linked Data PublishersUKGovernmentUS GovernmentBBCOpen Calais – Thomson ReutersFreebase/GoogleNY TimesBest BuySearsKmartOverstock.comCNETDbpediaO’Reilly Media…
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- 85. September 2011Linking OpenData cloud diagram, by Richard Cyganiak and AnjaJentzsch.http://lod-cloud.net/
- 86. YOU GET THEPICTUREITS BIG and getting BIGGER andBIGGER
- 87.