linked open data: an overview

Iván Ruiz Rube Departamento de Lenguajes y Sistemas Informáticos

Universidad de Cádiz

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Linked Open Data:

an overview

Hackaton 2011. OSLUCA.

Roadmap

Introduction

Publishing Data

Consuming Data

Conclusions

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INTRODUCTION

LINKED OPEN DATA: AN OVERVIEW

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Introduction

Huge amount of

information

A large number of

information

systems

Big challenges: ◦ Data integration

◦ Data analysis

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Need for open data

Improvement of

organizational

transparency

Public data

Foster the

research

Promote the

development of

third-party system

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Linked Open Data

“A method of publishing structured data so that it can be

interlinked and become more useful.

…it extends web pages to share information in a way that can

be read automatically by computers.”1

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1Tim Berners-Lee

Resource Description Format

author

publishedIn

2008

http://publisher.org/Journals/

JournalSWIS

year

http://w3c.org

director

Linked Data -

The Story So Far

title

http://w3.org/People/

Berners-Lee

http://publisher.org/Papers/

Paper12345

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http://xmlns.com/foaf/

Person

type

RDF (sintaxis)

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<http://publisher.org/Papers/Paper12345>

title "Linked Data - The Story So Far";

year "2008-01-01";

author <http://w3.org/People/Berners-Lee>;

publishedIn <http://publisher.org/Journal/JournalSWIS> .

<rdf:Description rdf:about="http://publisher.org/Papers/Paper12345">

<title>Linked Data - The Story So Far</title>

<year>2008-01-01</year>

<author rdf:resource="http://w3.org/People/Berners-Lee" />

<publishedIn rdf:resource="http://publisher.org/Journal/JournalSWIS" />

</rdf:Description>

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Ontologies (vocabularies)

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“An ontology is an explicit and formal specification of a shared

conceptualization1“

1Tom Gruber

Hackaton 2011. OSLUCA.

Linked Data Cloud

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Is your Linked Open Data 5 Star?

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★ Available on the web (whatever

format), but with an open license

★★ Available as machine-readable

structured data (e.g. excel instead of

image scan of a table)

★★★ as (2) plus non-proprietary

format (e.g. CSV instead of excel)

★★★★ All the above plus, Use open

standards from W3C (RDF and

SPARQL) to identify things, so that

people can point at your stuff

★★★★★ All the above, plus: Link

your data to other people’s data to

provide context

PUBLISHING DATA

LINKED OPEN DATA: AN OVERVIEW

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How is your data currently stored?

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How to publish Linked Data?

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2008

JournalSemanticWeb

W3C

The Story

So Far

Berners-Lee LinkedData

Publishing Linked Data Patterns

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CONSUMING DATA

LINKED OPEN DATA: AN OVERVIEW

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Rich interfaces (for humans)

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<http://voa3r.cc.uah.es/dataset/resource/organisationUnits/UAH>

rdf:type cerif:OrganisationUnit ;

rdfs:label "University of Alcala" ;

cerif:acronym "UAH" ;

foaf:homepage <http://www.uah.es> ;

cerif:researchProjects

<http://voa3r.cc.uah.es/dataset/resource/projects/Organic.Edunet> , <http://voa3r.cc.uah.es/dataset/resource/projects/Organic.Lingua> , <http://voa3r.cc.uah.es/dataset/resource/projects/VOA3R> ;

cerif:members

<http://voa3r.cc.uah.es/dataset/resource/person/Salvador_Sanchez> , <http://voa3r.cc.uah.es/dataset/resource/person/Miguel_Refusta> , <http://voa3r.cc.uah.es/dataset/resource/person/Luis_Torrico> .

RDF Data (for machines)

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RDF Data (for humans)

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Querying RDF Data

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Developing web mashups

Internet Navigator

URL: http://mashup.org File Favourites Help

mashup

Data

warehouse

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CONCLUSIONS

PUBLISHING LINKED DATA FROM RELATIONAL DATABASES

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Conclusions

Web based on documents Web based on Data.

Linked Data as a way for interchanging data between different datasets in the Web.

RDF as a standard format to describe data.

Main aim: Create new third-party applications using open linked data from LD systems.

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References

Linked Data: Evolving the Web into a

Global Data Space

◦ http://linkeddatabook.com/

W3C Linking Open Data Project

◦ http://www.w3.org/wiki/SweoIG/TaskForces/C

ommunityProjects/LinkingOpenData

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Iván Ruiz Rube ivan.ruiz@uca.es

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Linked Open Data: an overview

thanks

Hackaton 2011. OSLUCA.