Your SlideShare is downloading. ×
0
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
2011 05-01 linked data
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

2011 05-01 linked data

677

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
677
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Β´μέρος: linked data<br />After XML: semantic Web<br />Mostly for research and sophisticated business<br />Lightweight Semantic Web = Linked Data <br />1<br />
  • 2. From Al Gore <br />(internet highways) <br />to Barack Obama <br />(linked data)<br />2<br />
  • 3. The Web of Documents<br /><ul><li>Analogy:a global file system
  • 4. Designed for: human consumption
  • 5. Primary objects: documents
  • 6. Links between: documents(or sub-parts of)
  • 7. Degree of structure in objects: fairly low
  • 8. Semantics of content and links: implicit (humans)</li></ul>(Tom Heath)<br />The web = the internet<br />+ links + documents<br />3<br />
  • 9. The Web of Documents<br /><ul><li>Simple, big and unstructured
  • 10. Organized in Silos</li></ul>But humans are interested in:<br /><ul><li>Things, no documents and
  • 11. these Thingsmight be</li></ul>in documents or elsewhere<br /><ul><li>Humans: Limited capacity </li></ul>to extract meaning...<br />4<br />
  • 12. Limited SEARCH capacity<br />Search for: Football Players who went to the University of Texas at Austin, played for the Dallas Cowboys as Cornerback<br />(Juan F. Sequeda)<br />5<br />
  • 13. Google, Bing, yahoo! irrelevant<br />6<br />
  • 14. Wikipedia through LD: relevant<br />7<br />
  • 15. The Web of Data<br /><ul><li>Analogy:a global filesystem----> globaldatabase
  • 16. Designed for: human consumption ->machines first, humans later
  • 17. Primary objects: documents --> things (or descriptions of things)
  • 18. Links between: documents--> things
  • 19. Degree of structure in objects: fairly low ---> high
  • 20. Semantics of content and links: implicit --> explicit</li></ul>(Tom Heath)<br />8<br />
  • 21. The Modigliani Test<br />Show me all the locations of all the original paintings of Modigliani<br />Daniel Koller (@dakoller) showed that you can find this with a SPARQL query on DBpedia<br />Thanks Richard MacManus - ReadWriteWeb<br />
  • 22.
  • 23. Results of the Modigliani Test<br />Atanas Kiryakov from Ontotext<br />Used LDSR – Linked Data Semantic Repository<br />Dbpedia<br />Freebase<br />Geonames<br />UMBEL<br />Wordnet<br />Published April 26, 2010:<br /> http://www.readwriteweb.com/archives/the_modigliani_test_for_linked_data.php<br />
  • 24.
  • 25. The Web of Data: why?<br />– encourages reuse<br />– reduces redundancy<br />– maximises its (real and potential) inter-connectedness<br />– enables network effects to add value to data<br />13<br />
  • 26. The Web of Data: how?<br />– current state on the Web<br /><ul><li>Relational Databases
  • 27. APIs
  • 28. XML
  • 29. CSV
  • 30. XLS</li></ul>(see EXHIBIT)<br />Computers can’t consume data because:<br /><ul><li>Different formats & models
  • 31. Not inter-connected</li></ul>14<br />
  • 32. The Web of Data: how?<br />– we need to create a standard way of publishing Data on the Web (like HTML for docs)<br />This is the Resource Description Framework (RDF)<br />(a simple example here from Juan F. Sequeda), more next semester!)<br />15<br />
  • 33. Resource Description Framework (RDF)<br /><ul><li>A data model
  • 34. A way to model data
  • 35. Inspired form Relational databases and Logic
  • 36. RDF is a triple data model
  • 37. Labeled Graph (semantic networks)
  • 38. Subject, Predicate, Object</li></ul><Isidoro> <was born in> <Chios><br /><Chios> <is part of> <Greece><br />
  • 39. The RDF Data Model<br />Triples<br />subject -> predicate -> object<br />Tom -> worksFor -> Talis<br />Talis -> basedIn -> Birmingham<br /><uri> -> <uri> -> <uri> or "literal"<br />
  • 40. παράδειγμα<br />“Talis is Based Near Birmingham”<br /><http://dbpedia.org/resource/Talis_Group><br /><http://xmlns.com/foaf/0.1/based_near><br /><http://sws.geonames.org/3333125/><br />
  • 41.
  • 42. Example: Document on the Web<br />
  • 43. Databases back up documents<br />THINGS have PROPERTIES:<br />A Book as a Title, an author, …<br />This is a THING:<br />A book title “Programming the Semantic Web” by Toby Segaran, …<br />
  • 44. Data representation in RDF<br />Programming the Semantic Web<br />title<br />author<br />book<br />Toby Segaran<br />isbn<br />978-0-596-15381-6<br />publisher<br />name<br />Publisher<br />O’Reilly<br />
  • 45. Everything on the web is identified by a URI!<br />
  • 46. link the data to other data<br />Programming the Semantic Web<br />title<br />author<br />http://…/isbn978<br />Toby Segaran<br />isbn<br />978-0-596-15381-6<br />publisher<br />name<br />http://…/publisher1<br />O’Reilly<br />
  • 47. consider the data from Revyu.com<br />hasReview<br />http://…/review1<br />http://…/isbn978<br />description<br />reviewer<br />Awesome Book<br />http://…/reviewer<br />name<br />Juan Sequeda<br />
  • 48. start to link data<br />hasReview<br />http://…/review1<br />http://…/isbn978<br />Programming the Semantic Web<br />title<br />description<br />sameAs<br />hasReviewer<br />Awesome Book<br />author<br />http://…/isbn978<br />Toby Segaran<br />http://…/reviewer<br />name<br />isbn<br />978-0-596-15381-6<br />Juan Sequeda<br />publisher<br />name<br />http://…/publisher1<br />O’Reilly<br />
  • 49. Juan Sequeda publishes data too<br />http://juansequeda.com/id<br />http://dbpedia.org/Austin<br />livesIn<br />name<br />Juan Sequeda<br />
  • 50. Let’s link more data<br />hasReview<br />http://…/review1<br />http://…/isbn978<br />description<br />hasReviewer<br />Awesome Book<br />http://…/reviewer<br />name<br />Juan Sequeda<br />sameAs<br />http://juansequeda.com/id<br />http://dbpedia.org/Austin<br />livesIn<br />name<br />Juan Sequeda<br />
  • 51. And more<br />hasReview<br />http://…/review1<br />http://…/isbn978<br />Programming the Semantic Web<br />title<br />description<br />sameAs<br />hasReviewer<br />Awesome Book<br />author<br />http://…/isbn978<br />Toby Segaran<br />http://…/reviewer<br />name<br />isbn<br />978-0-596-15381-6<br />Juan Sequeda<br />publisher<br />sameAs<br />http://…/publisher1<br />name<br />O’Reilly<br />http://juansequeda.com/id<br />http://dbpedia.org/Austin<br />livesIn<br />name<br />Juan Sequeda<br />
  • 52. Linked data = internet + http + RDF<br />
  • 53. Linked Data Principles<br />Use URIs as names for things<br />Use URIs so that people can look up (dereference) those names.<br />When someone looks up a URI, provide useful information.<br />Include links to other URIs so that they can discover more things.<br />
  • 54. Web as a database<br />Linked Data makes the web exploitable as ONE GIANT HUGE GLOBAL DATABASE!Is there any query language like sql?SPARQL… (next semester)<br />
  • 55. History of LD<br /><ul><li>Linked Data Design Issues by TimBL July 2006
  • 56. Linked Open Data Project WWW2007
  • 57. First LOD Cloud May 2007
  • 58. 1st Linked Data on the Web Workshop WWW2008
  • 59. 1stTriplification Challenge 2008
  • 60. How to Publish Linked Data Tutorial ISWC2008
  • 61. BBC publishes Linked Data 2008
  • 62. 2nd Linked Data on the Web Workshop WWW2009
  • 63. NY Times announcement SemTech2009 - ISWC09
  • 64. 1st Linked Data-a-thon ISWC2009
  • 65. 1st How to Consume Linked Data Tutorial ISWC2009
  • 66. Data.gov.uk publishes Linked Data 2010
  • 67. 2st How to Consume Linked Data Tutorial WWW2010
  • 68. 1st International Workshop on Consuming Linked Data COLD2010
  • 69. El.dbpedia.org</li></li></ul><li>May 2007<br />
  • 70.
  • 71. What is a Linked Data application/service?<br />Software system that makes use of data on the Web from multiple datasets and that benefits from links between the datasets<br />
  • 72. Characteristics of Linked Data Applications<br /><ul><li>Consume data that is published on the web following the Linked Data principles: an application should be able to request, retrieve and process the accessed data
  • 73. Discover further information by following the links between different data sources: the fourth principle enables this.
  • 74. Combine the consumed linked data with data from sources (not necessarily Linked Data)
  • 75. Expose the combined data back to the web following the Linked Data principles
  • 76. Offer value to end-users</li></li></ul><li>the 5 stars of open linked data<br />★make your stuff available on the Web (whatever format)<br />★★make it available as structured data (e.g. excel instead of image scan of a table)<br />★★★non-proprietary format (e.g. csv instead of excel)<br />★★★★use URLs to identify things, so that people can point at your stuff<br />★★★★★link your data to other people’s data to provide context<br />http://lab.linkeddata.deri.ie/2010/star-scheme-by-example/<br />
  • 77. Examples <br /><ul><li>Data.gov.uk
  • 78. http://wheredoesmymoneygo.org/
  • 79. http://energy.publicdata.eu/ee/vis.html
  • 80. Greece – not in Linked Data!
  • 81. http://geodata.gov.gr/geodata/
  • 82. Fuelprices.gr
  • 83. E-prices.gr
  • 84. Et.diavgeia.gov.gr</li></li></ul><li>40<br />
  • 85. 41<br />
  • 86. More Examples<br />http://data-gov.tw.rpi.edu/wiki<br />http://dbrec.net/<br />http://fanhu.bz/<br />http://data.nytimes.com/schools/schools.html<br />http://sig.ma<br />http://visinav.deri.org/semtech2010/<br />

×