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HACKATON 2011. OSLUCA
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Iván Ruiz Rube Departamento de Lenguajes y Sistemas Informáticos
Universidad de Cádiz
16/12/2011 1
Linked Open Data:
an overview
Hackaton 2011. OSLUCA.
Roadmap
Introduction
Publishing Data
Consuming Data
Conclusions
16/12/2011 2 Hackaton 2011. OSLUCA.
INTRODUCTION
LINKED OPEN DATA: AN OVERVIEW
16/12/2011 3 Hackaton 2011. OSLUCA.
Introduction
Huge amount of
information
A large number of
information
systems
Big challenges: ◦ Data integration
◦ Data analysis
16/12/2011 4 Hackaton 2011. OSLUCA.
Need for open data
Improvement of
organizational
transparency
Public data
Foster the
research
Promote the
development of
third-party system
16/12/2011 5 Hackaton 2011. OSLUCA.
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
16/12/2011 Hackaton 2011. OSLUCA. 6
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
16/12/2011 7 Hackaton 2011. OSLUCA.
http://xmlns.com/foaf/
Person
type
RDF (sintaxis)
16/12/2011 8
<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>
Hackaton 2011. OSLUCA.
Ontologies (vocabularies)
16/12/2011 9
“An ontology is an explicit and formal specification of a shared
conceptualization1“
1Tom Gruber
Hackaton 2011. OSLUCA.
Linked Data Cloud
16/12/2011 10 Hackaton 2011. OSLUCA.
Is your Linked Open Data 5 Star?
16/12/2011 Hackaton 2011. OSLUCA. 11
★ 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
16/12/2011 12 Hackaton 2011. OSLUCA.
How is your data currently stored?
16/12/2011 Hackaton 2011. OSLUCA. 13
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
16/12/2011 16 Hackaton 2011. OSLUCA.
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
16/12/2011 20 Hackaton 2011. OSLUCA.
Developing web mashups
Internet Navigator
URL: http://mashup.org File Favourites Help
mashup
Data
warehouse
16/12/2011 21 Hackaton 2011. OSLUCA.
CONCLUSIONS
PUBLISHING LINKED DATA FROM RELATIONAL DATABASES
16/12/2011 22 Hackaton 2011. OSLUCA.
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.
16/12/2011 23 Hackaton 2011. OSLUCA.
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
16/12/2011 24 Hackaton 2011. OSLUCA.
Iván Ruiz Rube [email protected]
16/12/2011 25
Linked Open Data: an overview
thanks
Hackaton 2011. OSLUCA.