Freebase, RDF and the Semantic Web
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Transcript of Freebase, RDF and the Semantic Web
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SF Semantic Web Meet-up May 2009 Colin Evans + Jamie Taylor
A socially managed semantic database
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A Brief History of Data Modeling
Photo CC-BY: http://en.wikipedia.org/wiki/File:McDonalds_on_Interstate_44.jpg
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Ugly Tabular Data
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A Simple Restaurant Schema
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A Simple Restaurant Schema
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A Big, Ugly Schema
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What Went Wrong?
• Things change
• Requirements change
• User expectations change
• Data structures change
• Our data models aren’t keeping up
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Using Graphs to Model Data
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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
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A
B
C
EF
E
D
C
B
A
Data Integration
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• 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?
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What is Freebase?
• Structured Database
• Strong Collaboratively Edited Subjects
• Strong Collaboratively Developed Semantics
• Open API + Open Data
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Freebase is a database of things.
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5,203,825 Topics
14,110,006 Named Entities
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Users can write to Freebase+ add entities+ add properties+ create data models!
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All objects in Freebase have strong identifiers!
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/guid/9202a8c04000641f8000000000009d0e
/business/cik/0000012927
/wikipedia/en_id/3709
/wikipedia/en/Boeing
/en/boeing
NYSE: BATYO: 7661
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Topics in Freebase are Unique(no two Topics represent the same thing)
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BoeingMarket Capitalization
CEO
Airc
raft
Man
ufac
ture
d Ticker Symbol
Subsidiaries
CIK Code
SIC Code
Operating IncomeDate Founded
Hea
dqua
rter
sP
olitica
l Contrib
utio
ns
Rock
ets
Manufa
cture
d
Once you access an object in Freebase you have access to all facets of information
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What are people doing with the results?
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Microsoft Political Blog
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What else can you do with Freebase?
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Use Freebase to publish into the LOD Cloud
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<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
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RDFa
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<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">Komala Vilas</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
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5,203,825 Topics
14,110,006 Named Entities
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Freebase Suggest
http://code.google.com/p/freebase-suggest/
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ACRE: The Freebase Javascript Development Environment
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The Acre application environment
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A source of Vocabularies
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Freebase is a database of types.
A source of Vocabularies
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publ
ic d
omai
n ph
oto:
htt
p://e
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ikip
edia
.org
/wik
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phot
o by
Jam
ie
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Can’t find a vocabulary you need?
Write your own!
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sameas.freebase.com
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/en/ibm
sameas.freebase.com
CIK0000051143
GovTrack
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MQL: Metaweb Query Language
{ “id”:”/en/ibm”, “type”:”/business/company”, “founded”:null}
Query:
July 15, 1916
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MQL Extensions + sameAs Map
{ “id”:”/en/ibm”, “type”:”/business/company”, “lod”:[{ }]}
Query:
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