Freebase is a socially managed semantic database containing over 12 million topics and 400 million relations, emphasizing data accuracy and user contributions. It features a rich schema with 10,448 properties organized into 641 domains and enables various queries via the Metaweb Query Language (MQL). The platform supports diverse topics ranging from music to sports and is designed for developers with extensive documentation and community support.

1. Freebase
A socially managed semantic database
Jamie Taylor
SemTech 2010 Data Camp

3. Freebase has Many Types of Things

4. 12 Million Topics

6. A Multiplicity Strong Identifiers
http://rdf.freebase.com/ns/en.berlin_wall
http://www.ellerdale.com/topics/view/0080-6ba0
http://www.bbc.co.uk/music/artists/7f347782-eb14-40c3-98e2-17b6e1bfe56c
http://musicbrainz.org/artist/7f347782-eb14-40c3-98e2-17b6e1bfe56c
http://rdf.freebase.com/ns/authority.musicbrainz.7f347782-eb14-40c3-98e2-17b6e1bfe56c

7. Relations
contains
400 Million
contained-by
event label
albums
member-of
member-of
nationality
education
education
contained-by

8. What’s in Freebase?

10. http://www.bestbuy.com/site/She+Wolf…
http://www.daylife.com/topic/Shakira
http://twitter.com/shakira
http://www.facebook.com/shakira
http://www.myspace.com/shakira
http://www.last.fm/music/Shakira
http://www.netflix.com/RoleDisplay/Shakira/20046629
http://www.guardian.co.uk/music/shakira

11. 99% pure
All data undergoes rigorous QA before load
Major focus is reconciliation
Use sampling to assure 99% accuracy
Data that does not meet 99% accuracy is not loaded

12. What's been built on Freebase?

13. Up to 100,000 Queries a Day
Quarterly dumps of graph
http://download.freebase.com

16. Users contribute data
Users extend the data model

17. The Freebase Commons
Top-level domains
·American football ·Internet
·Anime/Manga ·Language
·Architecture ·Law
·Astronomy ·Library
·Automotive ·Location
·Aviation ·Martial Arts
·Awards ·Measurement Unit
·Baseball ·Media Common
·Basketball ·Medicine
·Bicycles ·Metaweb Types
·Biology ·Meteorology
·Boats ·Military
·Broadcast ·Music
·Business ·Olympics
·Celebrities ·Opera
·Chemistry ·Organization
·Comics ·People
·Common ·Geography
·Computers ·Projects
·Conferences ·Protected Places
·Cricket ·Publishing
·Data World ·Radio
·Digicams ·Rail
·Education ·Religion
·Engineering ·Royalty
·Event ·Soccer
·Clothing and Textiles ·Spaceflight
·Fictional Universes ·Sports
·Film ·Symbols
·Food & Drink ·Tennis
·Freebase ·Theater
·Games ·Time
·Geology ·Transportation
schema = vocabulary
·Government ·Travel
·Hobbies and Interests ·TV
·Ice Hockey ·Video Games
·Influence ·Visual Art

18. The Scope of Schema
10,448 Properties
describing
4,936 Types*
organized into
641 Domains
(77 Commons)
*types with 10 or more instances

19. Strength through Exemplars
Type Instances
100,000,000
10,000,000
>10 instances,
1,000,000
100,000
4936 types
Instances
10,000
1,000
1424 Commons
100
10
1
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000
Rank

20. Metaweb Query Language
[{
"name" : null,
"type" : "/film/film"
}]
MQL

21. [{
"name" : null,
"type" : "/film/film",
"directed_by":{"id":"/en/george_lucas"},
"starring":[{
"actor":{"id":"/en/harrison_ford"}
}]
}]
MQL

22. [{
"name" : null,
"type" : "/film/film",
"directed_by":{"id":"/en/george_lucas"},
"starring": [{
"actor": {
"name": null,
"film": [{
"film": {"id": "/en/the_great_escape"}
}]
}
}]
}]
Donald Pleasence
THX 1138

23. Freebase Suggest

24. Reconciliation
{
"/type/object/name":"Blade Runner",
"/type/object/type":"/film/film",
"/film/film/starring/actor":["Harrison Ford", "Rutger Hauer"],
"/film/film/director":"Ridley Scott",
"/film/film/release_date_s":"1981"
}
[{
"id":"/guid/9202a8c04000641f8000000000009e89",
"name":["Blade Runner", "Bladerunner"],
"score":1.4320519,
"match":true,
"type":["/common/topic", "/film/film","/media_common/adapted_work", "/award/award_winning_work",
]},
{
"id":"/guid/9202a8c04000641f80000000002643d0",
"name":["Blade"],
"score":0.48852453,
"match":false,
"type":["/common/topic", "/film/film", "/award/award_winning_work", "/award/award_nominated_work",
]}
http://data.labs.freebase.com/recon/

25. Topic Blocks

26. Topic API
Shortcut to building Topic displays
Two forms:
basic (names, types, description)
standard (basic + keys, properties)
http://www.freebase.com/experimental/topic/standard?id=/en/ncis

27. Geo Search API
Semantic Spatial Semantic
http://www.freebase.com/docs/geosearch

28. Gridworks

29. Acre Development Environment

30. Getting Started++
• Freebase Documentation Hub
• http://www.freebase.com/docs
• Developer Mailing List
• http://lists.freebase.com/mailman/listinfo/freebase-discuss
• http://freebase.markmail.org
• Real Time help on IRC
• Freenode #freebase
• Freebase Happenings
• http://blog.freebase.com
• About the Graph Store
• Google: "ACM SIGMOD schema last tuple store"