Post on 11-May-2015
Linked Data and SKOS2011 Workshop on Physics Classification, Boston
November 28th, 2011
Bernhard Haslhofer | Cornell University, Information Science
2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011
Linked Data
2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011
Web Architecture
HTML HTML HTML
hyperlinks hyperlinks
2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011
But sometimes we need programmatic access the underlying content, metadata, and vocabularies.
2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011
Web APIs
API API API API API
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
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
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
...
...
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)
2011 Workshop on Physics Classification | Boston, MA | Nov. 28th, 2011
The Simple Knowledge Organization System (SKOS)
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
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/> .
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
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
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
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
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