linked data and skos

Linked Data and SKOSConnecting the dots.

Mag. Andreas BlumauerSemantic Web Company

• Brief introduction to Linked Data• Very brief introduction to SKOS based

Thesaurus Management• Linked Data & SKOS

1. Publishing SKOS thesauri as linked data2. Generate SKOS from LOD sources3. Usage of SKOS thesauri for entity extraction

& content enrichment from LOD sources4. Use linked data mechanisms for collaborative thesaurus

management5. Usage of SKOS for linked data alignment & disambiguation

• Conclusio

Agenda

© Semantic Web Company – http://www.semantic-web.at/ 2


Brief introduction toLinked Data


Towards a „Web of Data“

Web of Data Hyperdata

Data on the Web (Open Data)

Web of Documents Hypertext

Documents on the Web

From ‚Gopher‘ to ‚Super-Mashups‘



Live-Demohttp://reegle.info/countries

reegle.info

Find drugs - related to asthma - that are linked to a curated molecular interaction in the literature - where the protein is known to cause inflammatory response

Answering questions


bio:Inflammation

dbpedia:Protein_XY

caused by

Drug:Auranofin

Molecule_Interaction_Z24

pubed:Paper4018

contains

dbpedia:Asthma

treats related topic


How it works

http://sws.geonames.org/3374084/child of: http://sws.geonames.org/6255149/ parent of: http://sws.geonames.org/3373557/ long: 59.53lat: 13.16

http://dbpedia.org/resource/Grapefruitsubject: category:Flora_of_Barbadosthumbnail: http://upload.wikimedia.org/...

The grapefruit is a subtropical citrus tree first bred in Barbados.

http://rdf.freebase.com/rdf/en.grapefruitvitamin_c: 0.0344gdietary_restrictions: gluten-free_dietdiets_that_like_this: grapefruit_diet

Linked Open Data (LOD) Cloud


Source: http://www4.wiwiss.fu-berlin.de/lodcloud/state/

State of the Linked Data Cloud



DomainNumber of datasets

Triples % (Out-)Links %

Media 25 1,841,852,061 5.82 % 50,440,705 10.01 %

Geographic 31 6,145,532,484 19.43 % 35,812,328 7.11 %

Government 49 13,315,009,400 42.09 % 19,343,519 3.84 %

Publications 87 2,950,720,693 9.33 % 139,925,218 27.76 %

Cross-domain

41 4,184,635,715 13.23 % 63,183,065 12.54 %

Life sciences 41 3,036,336,004 9.60 % 191,844,090 38.06 %

User-generated content

20 134,127,413 0.42 % 3,449,143 0.68 %

29531,634,213,7

70503,998,8

29

Core disciplines: entity extraction, disambiguation & data alignment


The grapefruit is a subtropical citrus tree bred in Barbados.

Context Elicitation

Grapefruit (Citrus paradisi)is a subtropical citrus tree firstbred in Barbados.

• Super-Mashups


Two main applications of linked data

• Complex search queries

• Which other fruits provide a comparable amount of vitamin C like grapefruits do?

• Which country produces the most grapefruits per capita?

• What is the relation between grapefruits and Georgian wine?

Dietary restrictions•Gluten-free diet•Vegetarian•Veganism

Other plants from Barbados•Coconut•Matico•Grandleaf Seagrape

Top Producers•USA•China•South Africa


The technical perspective: data integration the classical way

Data integration realised at application layer Implicit conceptual model


The technical perspective: data integration the linked data way

Integration on data level

Application on top of explicit conceptual model

The business perspective: costs of data integration


Source: Price Waterhouse Coopers – Technology Forecast, Spring 2009


Linked Data: Use Cases

1. Linked Data for internal data integration

2. Linked Data Consuming

3. Linked Data Publishing

4. Combine 1, 2, 3

1.

3.

2.

Linked data – the next evolution of the database?


Source: Fujitsu – White Paper Linked Data: March 2012


Thesaurus Managementbased on SKOS

SKOS stands for ‚Simple Knowledge Organization System‘


• W3C Standard since 2009

• Based on SemanticWeb standards

• Open for linking withadditional linked data

• W3C Standard since 2009

• Based on SemanticWeb standards

• Open for linking withadditional linked data

http://www.w3.org/2004/02/skos/


Live-Demohttp://scot.curriculum.edu.au/

Example: Schools Online Thesaurus

SKOS stands for ‚Simple Knowledge Organization System‘


1. Each concept in one or many concept schemes2. Each concept has one URI3. Each concept has one ore more labels4. (Poly-)Hierarchical and non-hierachical relations5. Matching between concepts from various sources

1. Each concept in one or many concept schemes2. Each concept has one URI3. Each concept has one ore more labels4. (Poly-)Hierarchical and non-hierachical relations5. Matching between concepts from various sources

1.

2.

3.

4.

5.


Linked Data & SKOS

Usage of SKOS in the linked open data cloud



1. Thesauri like• TheSoz (GESIS)• STW (Leibniz)• GBA (Geological Survey,

A)• …

2. SKOS ‚fragments‘ like in• DBPedia (categories)• New York Times Dataset• …

22%

27%

31%

Publishing SKOS as Linked Data


http://vocabulary.semantic-web.at/PoolParty/wiki/semweb

Generate SKOS from Linked Data sources


Live-Demohttp://pilot4.poolparty.biz/PoolParty/wiki/Sustainability http://vocabulary.semantic-web.at/PoolParty/wiki/cocktails

Using SKOS for entity extraction& content enrichment


Live-Demohttp://poolparty.biz/demozone

http://pilot4.poolparty.biz/extractor/testextractor

Collaborative thesaurus management


Live-Demohttp://bit.ly/J16GWD

SKOS & Linked data alignment (1)


Live-Demohttp://open.poolparty.punkt.at/PoolParty/

SKOS & Linked data alignment (2)


Live-Demohttp://bit.ly/semantic_search

Download slides: http://www.slideshare.net/semwebcompany Try PoolParty: http://poolparty.biz/try-it

Conclusio


Contact

Semantic Web Company GmbHMariahilfer Strasse 70/81070 ViennaAustria

http://www.semantic-web.at/ http://poolparty.biz

Andreas [email protected]

31© Semantic Web Company – http://www.semantic-web.at/

http://lod2.eu/

http://lassoproject.org

linked data and skos

Technology

data http

linked data wayapplication

linked data mechanisms

linked data consuming

linked data publishing7

data skos1

asubtropical citrus

internal data integration3