Freebase Schema
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Freebase SchemaJamie Taylor
Wednesday, December 8, 2010
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Goals
• Schema: The Freebase Data Model
• Schema as API
• Schema patterns
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Freebase is a collection of factsSofia Coppola directed Marie Antoinette{ { {Freebase only contains
nodes and LinksWednesday, December 8, 2010
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Freebase is a Graph
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Freebase is a labeled Graph
directed
parent sibling
child wrote
directed
directed
starred_in
starred_in
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Schema
"All the things you can say about something in Freebase"
Schema is the data model for Freebase
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All nodes are “/type/object”
name
“Francis Coppola”
type/people/person
id/m/02vyw
[{ "id":"/m/02vyw", "name":null, "type":[{}]}]
/type/object/name
type /film/director
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/en/bram_stokers_dracula
Types suggest properties to use
id/m/02vyw
type /film/director
/film/d
irecto
r/film
/type/object/idWednesday, December 8, 2010
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Queries follow schema
[{ "id": "/en/francis_ford_coppola", "/film/director/film": [{ "id":null, "name":null }]}]
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Properties link the graph together
id/m/02vyw
type /film/director
/en/bram_stokers_dracula/type/object/id/fil
m/dire
ctor/fi
lm
written_by
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Queries follow schema
[{ "id": "/en/francis_ford_coppola", "/film/director/film": [{ "id": "/en/bram_stokers_dracula", "written_by":null }]}]
Name is returned(how to get ID?)
How to get all the writters for all of Coppola’s movies?
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Core Concepts
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Core Concepts
Instance:• Topic: "a thing in the world"
• Blade Runner, Ridley Scott, NBC, Last Proof
Schema:• Types - Categorical collections of instances
• Properties - Relationships between instances
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Core Concepts
An instance may have multiple Types• "Co-Types" (Types are mix-ins)
• Arnold Schwartzeneger
• Person, Actor, Politician, Sports Figure
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Lessons from everyday vocabulary
Wikipedia Word Frequency
0
2000000
4000000
6000000
8000000
10000000
12000000
14000000
16000000
18000000
20000000
0 20 40 60 80 100 120
Rank
Freq
uen
cy
Data from Victor S. Grishchenko
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Schema Principle #1
Use Co-Types Liberally:
Use a few large, encompassing Types to provide general information
Use several smaller, fine grained Types to provide detailed information
Event Example:-Film Festival-Battle of Waterloo
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Core Concepts
Properties are defined on Types• Properties are the vocabulary for a specific Type
• An instance must be “an instance of a type” before it can use the Type’s properties to describe itself
Relational DBvsRDF
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Core Concepts
• A Property Value has a specific Type• "Expected Type"
• A Property has exactly one Expected Type
Manufactures
Expected Type ~ RDFS Range
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Core Concepts
Expected Types (Property Values):• Value Types (literals)
• String (two flavors), Integer, Float, DateTime, boolean
• Object Types
• Everything Else
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/type/object
Everything in Freebase has this Type
Provides basic properties
• Type
• Name
• .......
All other Properties come from some other Type!
contrast to common topic
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/common/topic
"Topics"• Things we have discourse about
• Provides properties:
• Alias
• Article
• Image
• Weblinks
• Assumed to be an "Included Type" for any "standard" type
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Schema Patterns
Compound Value
Mediator
Phylogeny
Enumeration
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Compound Value
Two or more properties which can only be interpreted with regard to one another
Population
• Dated Integer ("when did this location have that many people")
Movie Budget
• Dated money value
• Date, Currency, Amount
Ticker Symbol
• Exchange, Symbol
complex literal
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Compound Value
{ "id": "/en/apocalypse_now", "type": "/film/film", "estimated_budget": [{ "currency": null, "amount": null, "valid_date": null }]}
estimated_budget
currency
valid_date
amount 31MM
1979
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MediatorAn annotation on the link between two Topics• Requires an object between the two Topics
• The Topics become separated by two properties
actor performance film
character
• Also useful for indicating the dates when a relationship existed (e.g., education, employment, etc.)
combine date annotation and character = tv character
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Mediator
{ "id": "/en/marie_antoinette_2006", "type": "/film/film", "starring": [{ "actor":null, "character":null }]}
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Phylogeny
Examples:
• /location/location/containedby
• /computer/computer/parent_model
• /tv/tv_program/spin_offs
Used when instances form a hierarchy
Phylogeny properties have an expected Type which is the same as the Type on which the property is defined.
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Phylogeny
Why can I use the short name??
{ "id": "/en/fairfax_california", "/location/location/containedby": [{ "id": null, "containedby": [{ "id": null }] }]}
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Enumerated Value
Closed collection of “values” for a property
Constrains relations to fixed set of objects
• /people/person/gender
{ female, male, other }
• /visual_art/visual_artist/art_forms
{ drawing, painting, print making, photography.... }
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Explore the Freebase Graph
directed
parent sibling
child wrote
directed
directed
starred_in
starred_in
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Explore the Freebase Graph
[{ "id": null, "type": "/film/director"}]
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Explore the Freebase Graph
[{ "id": null, "type": "/film/director", "/people/person/children": [{ "id": null, "type": "/film/director" }]}]
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Explore the Freebase Graph
[{ "id": null, "type": "/film/director", "film":[ ], "/people/person/children": [{ "id": null, "type": "/film/director" "film":[ ] }]}]
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Explore the Freebase Graph[{ "id": null, "type": "/film/director", "film": [ ], "/people/person/children": [{ "id": null, "type": "/film/director", "film": [{ "name":null, "starring": [{ "actor": null }] }] }]}]
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acto
rfilm
"Harrison Ford"
sta
rring
film
film
actor
person
"Blade Runner"
name
name
performance
date_of_birth
1942-07-13
film character
"Rick Deckard"
name
type
type
"film"
name
insta
nce
type
instance
type
type
"actor"
name
type
"person"
name
type
insta
nce
type
insta
nce
type
insta
nce
type
inst
ance
properties
property
type
"date of birth"
name
expected_typedate_time
type
instance
/
/film
film (key)
/people
people (key)
type
type
instance
name
"domain"
type
instance
type
instance
pers
on (
key)
film (ke
y)
LEGEND
/type/object + /common/topic
/type/object
outgoing incoming
keyvalue (key)
outgoing property
literal value
/namespace
obj type
domain
namespace
domain
"type"
name type
instance
type
type
instance
"property"name
property
type
instance
"expected type"
name
expected_type
insta
nce
properties
It’s all nodes and links!
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"commons" individual's "bases"
"domains"
BladeRunner
promote
Domains, Bases and Commons
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Questions?!
Docs: www.freebase.com/docs
Wiki: wiki.freebase.com
Mailing List: lists.freebase.com
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