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Linked Data:A 30-Minute Crash Course!

Tom Heath

Lead ResearcherTalis Systems Ltd

July 2011, SSSW2011, Cercedilla, Spain

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Outline

• No “hard sell” about Linked Data, just the basic concepts

• A basic introduction to the topic– Graphs– RDF Triples– URIs for documents and things– Links between (things in different) data sets

• A brief mention of some useful data sets• Outline of the hands-on session

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Tom

What is a Graph?

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TomTalis

What is a Graph?

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TomTalis

employedBy

What is a Graph?

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Tom

Bristol

TalisemployedBy

livesIn

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

employedBy

livesIn

favouriteDrink

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Whisky

employedBy

livesIn

favouriteDrink

isA

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

ScotlandisIn

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

Software

industry

ScotlandisIn

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

Software

industry

Birmingham

basedIn

ScotlandisIn

What is a Graph?

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Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

Software

industry

Ian Davis

employedBy

Birmingham

basedIn

ScotlandisIn

What is a Graph?

shared innovation

Tom

Bristol

Talis

Ardbeg

Islay

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

ScotlandisIn

Software

industry

Birmingham

basedIn

Ian Davis

employedBy

England

bornIn

What is a Graph?

shared innovation

Tom

Bristol

Talis

Birmingham

England

Ian Davis

Ardbeg

Islay

Software

Scotland

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

isIn

borders

basedIn

industry

employedBy

bornIn

What is a Graph?

shared innovation

Tom

Bristol

Talis

Birmingham

England

Ian Davis

Ardbeg

Islay

Software

Scotland

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

isIn

borders

basedIn

industry

employedBy

bornIn

City

isA

What is a Graph?

shared innovation

Tom

Bristol

Talis

Birmingham

England

Ian Davis

Ardbeg

Islay

Software

Scotland

Whisky

employedBy

livesIn

favouriteDrink

isA

origin

isIn

borders

basedIn

industry

employedBy

bornIn

City

isAisA

What is a Graph?

shared innovation

Tom

Bristol

Talis

Birmingham

England

Ian Davis

Ardbeg

Islay

Software

City

Scotland

Whisky

employedBy

livesIn

favouriteDrink

isA

isAisA

origin

isInisIn

isIn

borders

basedIn

industry

employedBy

bornIn

What is a Graph?

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SubjectObject

Predicate

The RDF Data Model: Triples

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TomTalis

employedBy

The RDF Data Model: Triples

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Tom

Bristol

Talis

Birmingham

England

Ian Davis

Ardbeg

Islay

Software

City

Scotland

Whisky

employedBy

livesIn

favouriteDrink

isA

isAisA

origin

isInisIn

isIn

borders

basedIn

industry

employedBy

bornIn

1 Graph, 15 RDF Triples

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Birmingham

England

Ian Davis

Islay

Software

City

Scotland

Whisky

isAisA

origin

isInisIn

isIn

borders

basedIn

industry

employedBy

bornIn

isA

Bristol

livesIn

Ardbeg

favouriteDrink

TalisemployedByTom

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isIn

Birmingham

England

Ian Davis

Software

City

isAisA

isInisIn

borders

basedIn

industry

employedBy

bornIn

Bristol

livesIn

favouriteDrink

TalisemployedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

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isIn

England

Ian Davis

City

isAisA

isInisIn

borders

employedBy

bornIn

Bristol

livesIn

favouriteDrink

employedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

Birmingham

SoftwarebasedIn

industry

Talis

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isIn

England

City

isAisA

isInisIn

borders

Bristol

livesIn

favouriteDrink

employedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

Birmingham

SoftwarebasedIn

industry

Ian Davis

employedBy

bornIn

Talis

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livesIn

favouriteDrink

employedByTom

Whisky

origin

isAArdbeg

Software

industry

Ian Davis

employedBy

bornIn

Talis

basedInCity

isIn

England

isAisA

isInisIn

borders

Bristol

ScotlandIslay

Birmingham

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Birmingham

England

Ian Davis

Islay

Software

City

Scotland

Whisky

isAisA

origin

isInisIn

isIn

borders

basedIn

industry

employedBy

bornIn

isA

Bristol

livesIn

Ardbeg

favouriteDrink

TalisemployedByTom

http://tomheath.com/tom.rdf

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isIn

Birmingham

England

Ian Davis

Software

City

isAisA

isInisIn

borders

basedIn

industry

employedBy

bornIn

Bristol

livesIn

favouriteDrink

TalisemployedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

http://wiskii.com/ardbeg.rdf

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isIn

England

Ian Davis

City

isAisA

isInisIn

borders

employedBy

bornIn

Bristol

livesIn

favouriteDrink

employedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

Birmingham

SoftwarebasedIn

industry

Talis

http://www.talis.com/talis.rdf

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isIn

England

City

isAisA

isInisIn

borders

Bristol

livesIn

favouriteDrink

employedByTom

Scotland

Whisky

Islay

origin

isAArdbeg

Birmingham

SoftwarebasedIn

industry

Ian Davis

employedBy

bornIn

Talis

http://iandavis.com/ian.rdf

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livesIn

favouriteDrink

employedByTom

Whisky

origin

isAArdbeg

Software

industry

Ian Davis

employedBy

bornIn

Talis

basedInCity

isIn

England

isAisA

isInisIn

borders

Bristol

ScotlandIslay

Birmingham

http://geonames.org/uk.rdf

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Talis

Birmingham

England

Ian Davis

Software

City

employedBy

isAisA

isIn

basedIn

industry

employedBy

bornIn

isIn

borders

http://wiskii.com/Ardbeg

http://plac.es/Bristol

http://tomheath.com/id/me

http://wiskii.com/Islay http://plac.es/Scotland

http://drin.kr/Whisky

http://worklife.eg/livesIn

http://drin.kr/favouriteDrink

http://rels.com/isA

http://wiskii.com/origin

http://rels.com/isIn

URIs for All Things (Not Just for Documents)

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livesIn

favouriteDrink

employedByTom

Whisky

origin

isAArdbeg

Software

industry

Ian Davis

employedBy

bornIn

Talis

basedInCity

isIn

England

isAisA

isInisIn

borders

Bristol

ScotlandIslay

Birmingham

Islay

origin

isAArdbeg

Talking About the Same Thing

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livesIn

favouriteDrink

employedByTom

Whisky

origin

isAArdbeg

Software

industry

Ian Davis

employedBy

bornIn

Talis

basedInCity

isIn

England

isAisA

isInisIn

borders

Bristol

Scotland

Birmingham

http://my.eg/Islay

http://your.eg/Islay

owl:sameAs

Talking About the Same Thing

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Useful Data Sets

• Dbpedia: RDF descriptions of everything that has a Wikipedia page <http://dbpedia.org/>

• Geonames: data set about geographic locations, with RDF descriptions <http://geonames.org/>

• owl:sameAs links exist between many places that feature in both DBpedia and Geonames

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Anatomy of a Simple Linked Data Application

1. Look up a URI (HTTP GET)

2. Receive some RDF data in response (maybe via a redirect)

3. Do something useful with the data

4. Inspect the data for links to related things

5. Look up the URIs of related things

6. Go to Step 2.

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Linked Data Hands-On Session

• Build a simple city guide based on existing Linked Data sources

• Start with a seed URI for a city of your choice

• Populate a SimpleGraph object with data retrieved by looking up this URI

• Look for outgoing links in the data

• Look these up and add the resulting data to your SimpleGraph / Thing object

• Show some/all of the data you have retrieved as a Web page city guide

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Instructions

• http://tomheath.com/stuff/sssw2011/

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Questions?

• Contact Info– tom.heath@talis.com– http://tomheath.com/id/me– http://www.talis.com/– @tommyh (twitter)

• Slides– http://tomheath.com/slides/2011-07-cercedilla-

linked-data-a-30-minute-crash-course.pdf

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