linked data and skos

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Linked Data and SKOS 2011 Workshop on Physics Classification, Boston November 28th, 2011 Bernhard Haslhofer | Cornell University, Information Science

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Page 1: Linked Data and SKOS

Linked Data and SKOS2011 Workshop on Physics Classification, Boston

November 28th, 2011

Bernhard Haslhofer | Cornell University, Information Science

Page 2: Linked Data and SKOS

2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Linked Data

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Web Architecture

HTML HTML HTML

hyperlinks hyperlinks

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

But sometimes we need programmatic access the underlying content, metadata, and vocabularies.

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Web APIs

API API API API API

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Web APIs - Drawbacks

• Each Web API has a proprietary interface

• Datasources must be known in advance

• Information entities (papers, authors, subjects, etc.) are not linked

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Linked Open Data Vision

• Publish and link structured data on the Web

• Create a single global data space based on the Architecture of the World Wide Web

RDF RDF RDF

RDF links RDF links

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Linked Data Example

http://arxiv.org/resource/cond-mat/0512091

http://arxiv.org/authors/Peres_N

dcterms:creator

Electronic Properties of Disordered Two-Dimensional Carbon

dc:title

foaf:name

N. M. R. Peres

http://xmlns.com/foaf/spec/#term_Person

http://purl.org/ontology/bibo/Article

rdf:type

rdf:type

http://prb.aps.org/resource/PRB/v73/i12/e125411

http://aps.org/authors/peres_nmr

dcterms:creator

owl:sameAs

owl:sameAs

...

...

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Publishing Linked Data

• Distinguish between non-information (NIR) and information resource (IR)

• Sample NIR

• http://arxiv.org/resource/cond-mat/0512091

• Sample IRs

• http://arxiv.org/abs/cond-mat/0512091 (HTML)

• http://arxiv.org/data/cond-mat/0512091 (RDF)

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

The Simple Knowledge Organization System (SKOS)

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

What is SKOS?

• A language for describing controlled vocabularies (taxonomies, classification schemes, thesauri)

• Builds on Linked Data principles

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

SKOS Examples

arxiv:cond-mat

skos:Concept

rdf:type

@prefix skos: <http://www.w3.org/2004/02/skos/core#> .@prefix arxiv: <http://arxiv.org/subjects/> .

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

SKOS Examples

"Condensed Matter Physics"@en

skos:prefLabel

skos:Conceptarxiv:cond-mat

"Physics"@en

skos:altLabel

"Kondensierte Materie Physik"@deskos:prefLabel

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

SKOS Examples

"Physics - Statistical Mechanics"@enskos:prefLabelskos:Concept

arxiv:cond-mat.stat-mech

"Condensed Matter Physics"@enskos:prefLabelskos:Concept

arxiv:cond-mat

skos:broader

skos:broader

skos:narrower

skos:narrower

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

SKOS Example

skos:Conceptarxiv:cond-mat

skos:Concept...

skos:broader

skos:narrower

skos:related

dbpedia: Condensed_matter_

physics

skos:closeMatch

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

SKOS Examples

ex1:someConceptScheme ex2:otherConceptScheme

skos:Conceptarxiv:cond-mat

skos:Conceptarxiv:physics.data-

an

skos:Conceptaps:....

skos:Conceptaps:....

skos:exactMatch

skos:broadMatch

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2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011

Summary

• Linked Data is about exposing and linking structured data on the Web

• SKOS is a language for expressing controlled vocabularies

• SKOS vocabularies can be published as Linked Data