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Freebase, RDF and the Semantic Web
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Freebase, RDF and the Semantic Web

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A presentation to the SF Semantic Web Meet-up (5/14/09) describing Freebase and its connection to RDF, Linked Data and the Semantic Web.

A presentation to the SF Semantic Web Meet-up (5/14/09) describing Freebase and its connection to RDF, Linked Data and the Semantic Web.

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  • 1. SF Semantic Web Meet-up May 2009 Colin Evans + Jamie Taylor A socially managed semantic database
  • 2. A Brief History of Data Modeling Photo CC-BY: http://en.wikipedia.org/wiki/File:McDonalds_on_Interstate_44.jpg
  • 3. Ugly Tabular Data
  • 4. A Simple Restaurant Schema
  • 5. A Simple Restaurant Schema
  • 6. A Big, Ugly Schema
  • 7. What Went Wrong? • Things change • Requirements change • User expectations change • Data structures change • Our data models aren’t keeping up
  • 8. Using Graphs to Model Data
  • 9. Metadata is Data • Relationships are represented explicitly • Schema can be represented as a graph • Data integration is the union of two graphs • This makes creating, extending, and combining data much easier than before
  • 10. A B C E F E D C B A Data Integration
  • 11. • Semantics facilitate shared meaning through • Subject Identity • Strong and Consistent Semantics • Open APIS + Open Data • These principles make it much easier to extend, combine, and integrate data Why Does This Work?
  • 12. What is Freebase? • Structured Database • Strong Collaboratively Edited Subjects • Strong Collaboratively Developed Semantics • Open API + Open Data
  • 13. Freebase is a database of things.
  • 14. 5,203,825 Topics 14,110,006 Named Entities
  • 15. Users can write to Freebase + add entities + add properties + create data models!
  • 16. All objects in Freebase have strong identifiers!
  • 17. /guid/9202a8c04000641f8000000000009d0e /business/cik/0000012927 /wikipedia/en_id/3709 /wikipedia/en/Boeing /en/boeing NYSE: BA TYO: 7661
  • 18. http://blog.kiwitobes.com/?p=57
  • 19. Topics in Freebase are Unique (no two Topics represent the same thing)
  • 20. Boeing Market Capitalization CEO AircraftManufactured Ticker Symbol Subsidiaries CIK Code SIC Code Operating Income Date Founded Headquarters PoliticalContributions RocketsManufactured Once you access an object in Freebase you have access to all facets of information
  • 21. What are people doing with the results?
  • 22. Microsoft Political Blog
  • 23. What else can you do with Freebase?
  • 24. Use Freebase to publish into the LOD Cloud
  • 25. <fb:people.sibling_relationship rdf:about="http://rdf.freebase.com/ns/guid.9202a8c04000641f8000000004598a74"> <fb:people.sibling_relationship.sibling rdf:resource="http://rdf.freebase.com/ns/en.carlene_barous"/> <fb:people.sibling_relationship.sibling rdf:resource="http://rdf.freebase.com/ns/en.terri_brosius"/> </fb:people.sibling_relationship> http://rdf.freebase.com/ns/en.terri_brosius
  • 26. RDFa
  • 27. <span xmlns:v="http://rdf.data-vocabulary.org/" typeof="v:Review"> <span rel="v:itemReviewed"> <span about="http://komalavilas.com" property="v:name" typeof="v:Restaurant">KomalaVilas</span> </span> <span rel="v:reviewer"> <span about="http://rdf.freebase.com/ns/en.s_meenakshi_ammal" property="v:name">Meenakshi Ammal</span> </span> <span property="v:rating" >3.7</span> <span property="v:date">1st April 2005</span> <span property="v:summary"> Best south Indian vegetarian food in the bay area</span> </span> An example of an RDFa Restaurant Review
  • 28. 5,203,825 Topics 14,110,006 Named Entities
  • 29. Freebase Suggest http://code.google.com/p/freebase-suggest/
  • 30. ACRE: The Freebase Javascript Development Environment
  • 31. The Acre application environment
  • 32. A source of Vocabularies
  • 33. Freebase is a database of types. A source of Vocabularies
  • 34. publicdomainphoto:http://en.wikipedia.org/wiki/File:SwissReHQ.jpg
  • 35. photobyJamie
  • 36. Can’t find a vocabulary you need? Write your own!
  • 37. sameas.freebase.com
  • 38. /en/ibm sameas.freebase.com CIK 0000051143 GovTrack
  • 39. MQL: Metaweb Query Language { “id”:”/en/ibm”, “type”:”/business/company”, “founded”:null } Query: July 15, 1916
  • 40. MQL Extensions + sameAs Map { “id”:”/en/ibm”, “type”:”/business/company”, “lod”:[{ }] } Query: