2011 05-01 linked data

• 1.: linked data
  After XML: semantic Web
  Mostly for research and sophisticated business
  Lightweight Semantic Web = Linked Data
  1
  

2. From Al Gore
(internet highways)
to Barack Obama
(linked data)
2
3. The Web of Documents

• 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)(Tom Heath)
The web = the internet
+ links + documents
3
9. The Web of Documents

• Simple, big and unstructured

10. Organized in SilosBut humans are interested in:

• Things, no documents and

11. these Thingsmight bein documents or elsewhere

• Humans: Limited capacity

to extract meaning...
4
12. Limited SEARCH capacity
Search for: Football Players who went to the University of Texas at Austin, played for the Dallas Cowboys as Cornerback
(Juan F. Sequeda)
5
13. Google, Bing, yahoo! irrelevant
6
14. Wikipedia through LD: relevant
7
15. The Web of Data

• 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(Tom Heath)
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21. The Modigliani Test
Show me all the locations of all the original paintings of Modigliani
Daniel Koller (@dakoller) showed that you can find this with a SPARQL query on DBpedia
Thanks Richard MacManus - ReadWriteWeb
22. 23. Results of the Modigliani Test
Atanas Kiryakov from Ontotext
Used LDSR Linked Data Semantic Repository
Dbpedia
Freebase
Geonames
UMBEL
Wordnet
Published April 26, 2010:
http://www.readwriteweb.com/archives/the_modigliani_test_for_linked_data.php
24. 25. The Web of Data: why?
encourages reuse
reduces redundancy
maximises its (real and potential) inter-connectedness
enables network effects to add value to data
13
26. The Web of Data: how?
current state on the Web

• Relational Databases

27. APIs 28. XML 29. CSV 30. XLS(see EXHIBIT)
Computers cant consume data because:

• Different formats & models

31. Not inter-connected14
32. The Web of Data: how?
we need to create a standard way of publishing Data on the Web (like HTML for docs)
This is the Resource Description Framework (RDF)
(a simple example here from Juan F. Sequeda), more next semester!)
15
33. Resource Description Framework (RDF)

• 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

39. The RDF Data Model
Triples
subject -> predicate -> object
Tom -> worksFor -> Talis
Talis -> basedIn -> Birmingham
-> -> or "literal"
40.
Talis is Based Near Birmingham



41. 42. Example: Document on the Web
43. 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,
44. Data representation in RDF
Programming the Semantic Web
title
author
book
Toby Segaran
isbn
978-0-596-15381-6
publisher
name
Publisher
OReilly
45. Everything on the web is identified by a URI!
46. 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
OReilly
47. consider the data from Revyu.com
hasReview
http:///review1
http:///isbn978
description
reviewer
Awesome Book
http:///reviewer
name
Juan Sequeda
48. 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
OReilly
49. Juan Sequeda publishes data too
http://juansequeda.com/id
http://dbpedia.org/Austin
livesIn
name
Juan Sequeda
50. Lets 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
51. 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
OReilly
http://juansequeda.com/id
http://dbpedia.org/Austin
livesIn
name
Juan Sequeda
52. Linked data = internet + http + RDF
53. Linked Data Principles
Use URIs as names for things
Use 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.
54. Web as a database
Linked Data makes the web exploitable as ONE GIANT HUGE GLOBAL DATABASE!Is there any query language like sql?SPARQL (next semester)
55. History of LD

• 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