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Linking Open Data ,[object Object],[object Object]
Obligatory Children Slide
Credits: ,[object Object],[object Object]
Quote ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Objectives
Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Classic Data : in silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY
The Classic Web ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],B C HTML HTML HTML Web  Browsers Search  Engines hyper- links A
What do we actually want? Use the Web like a  single global  database.
Solution ,[object Object],[object Object],[object Object],Publish structured data directly on the Web Different Approaches
Web APIs
Mashups ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Mashup Up Web API A Web API B Web API C Web API D
Web APIs slice the Web into separate data silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY
What do we want? Use the Web as a single global database  using what we know works on the Web
Connecting Worlds One Web! Data Documents
What works on the Web? ,[object Object],[object Object],[object Object]
What works on the Web? ,[object Object]
Evolving the Link ,[object Object],[object Object],[object Object],page.html home.html
Evolving the Link ,[object Object],[object Object],[object Object],[object Object],page.html home.html home
Microformats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<div class=&quot;vevent&quot;> <span class=&quot;summary&quot;>bdigital</span>    <abbr class=&quot;dtstart&quot; title=&quot;2008-05-20&quot;>May 20</abbr> -    <abbr class=&quot;dtend&quot; title=&quot;2007-05-22&quot;>22</abbr> </div>
Evolving the Link ,[object Object],[object Object],[object Object],[object Object],[object Object],page home x:home
Linked Data B C Thing typed links A D E typed links typed links typed links Thing Thing Thing Thing Thing Thing Thing Thing Thing ,[object Object],[object Object],[object Object]
RDF Relations ,[object Object],[object Object],[object Object],[object Object],[object Object],x:home subject object http://example.org /page ... http://example.org /home ...
Identifiers ,[object Object],[object Object],[object Object]
Linked Data Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The RDF Data Model Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri
Data objects are identified with HTTP URIs pd:cygri Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri  = http://richard.cyganiak.de/foaf.rdf#cygri dbpedia:Berlin  = http://dbpedia.org/resource/Berlin
Follow Your Nose... Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject
Dereferencing URIs over the Web Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type dbpedia:Hamburg dbpedia:Muenchen skos:subject skos:subject pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject
Universal Connector <resourceB> rdfs:seeAlso <resourceA>
Universal Connector <resourceB> rdfs:seeAlso <resourceA> foaf:Person rdf:type
Take Care! <resourceB> owl:sameAs <resourceA>
The Disco – Hyperdata Browser
 
Semantic Web Specifications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Coming soon: POWDER, OWL2, RIF
What of Web Services? “ Web APIs Are Just Web Sites” - Paul Downey Linked Data is exposed as (very simple) RESTful services
What of RDF Stores? A triplestore is just a cache of a chunk of the Semantic Web Convenient for data merging, querying (SPARQL) and inference See also: Semantic Web Client Library
What of the Real World? source:  http://danbri.org/words/2008/04/15/300 based on timbl 1994
W3C Linking Open Data Project ,[object Object],[object Object],[object Object]
LOD Datasets on the Web:  May 2007
LOD Datasets on the Web:  August 2007
LOD Datasets on the Web: February 2008
LOD Datasets on the Web: September 2008
LOD Datasets on the Web:  March 2009
Spotlight: Geonames ,[object Object],[object Object]
Spotlight: DBpedia ,[object Object],[object Object]
Example RDF Links ,[object Object],[object Object],<http://dbpedia.org/resource/Berlin> owl:sameAs <http://sws.geonames.org/2950159> .  <http://richard.cyganiak.de/foaf.rdf#cygri> foaf:topic_interest <http://dbpedia.org/resource/Semantic_Web> . <http://dbpedia.org/resource/Tim_Berners-Lee> owl:sameAs <http://www4.wiwiss.fu-berlin.de/dblp/resource/person/100007> .
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Organizations publishing Linked Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Applications B C Thing typed links A D E typed links typed links typed links Thing Thing Thing Thing Thing Thing Thing Thing Thing Search  Engines Linked Data Mashups Linked Data Browsers ,[object Object]
Linked Data Browsers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tabulator
Linked Data Mashups ,[object Object],[object Object]
DBpedia Mobile ,[object Object],[object Object]
Web of Data Search Engines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Falcons
Why publish Linked Data on the Web? ,[object Object],[object Object],[object Object],[object Object]
Why publish Linked Data on the Web? ,[object Object],[object Object],[object Object],[object Object]
Linked Data Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example : Source Data
Example : First Pass @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix owl: <http://www.w3.org/2002/07/owl#> . @prefix x: <http://purl.org/stuff/astro#> . x:Megrez rdf:type x:A3_dwarf ; x:magnitude &quot;3.1&quot; ; x:partOf [ rdf:type x:Constellation ; x:hasName &quot;Ursa Major&quot;  ] . (RDF Turtle/N3 Syntax)
Example : Vocabulary @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . x:Star rdf:type rdfs:Class . x:Constellation rdf:type  rdfs:Class . x:A3_Dwarf rdfs:subClassOf x:Star . x:magnitude rdf:type rdf:Property . x:partOf  rdf:type rdf:Property . x:hasName  rdf:type rdf:Property .
But... ,[object Object],[object Object],[object Object],[object Object],Existing vocabularies and resource URIs are likely to be well-linked already –  reuse is good!
Example : Better Linkage @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . @prefix astro: <http://archive.astro.umd.edu/ont/astronomy.owl#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix dolce: <http://www.loa-cnr.it/ontologies/DOLCE-Lite.owl#> . @prefix dbpedia: <http://dbpedia.org/resource/> . dbpedia:Delta_Ursae_Majoris rdf:type x:A3_Dwarf ; foaf:name &quot;Megrez&quot;; x:magnitude &quot;3.1&quot; ; dolce:part-of dbpedia:Ursa_Major ; rdfs:seeAlso <http://www.dcs.gla.ac.uk/workshops/semast09> . dbpedia:Ursa_Major rdf:type astro:Constellation .
Mass-Publication Techniques ,[object Object],[object Object],[object Object]
New Vocabularies : voiD Vocabulary of Interlinked Datasets Classes:  Dataset | Linkset | TechnicalFeature | Properties:  statItem | feature | subset | target | sparqlEndpoint | linkPredicate | exampleResource | vocabulary | subjectsTarget | objectsTarget | dataDump | uriLookupEndpoint | uriRegexPattern |
New Vocabularies : Scovo Statistical Core Vocabulary
&quot;It is important to look as it as an interconnection bus, and it hasn't started working in earnest until one person's data is being used by some other unplanned use. This unexpected reuse is the measure.&quot; -  Tim Berners-Lee, re. State of the Semantic Web Finishing Quotes
&quot;Engineer for serendipity.&quot; -  Roy T. Fielding, re. REST Finishing Quotes
http://hyperdata.org/astronomy/ Related Links etc.

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Linked Data

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  • 7. Classic Data : in silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY
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  • 9. What do we actually want? Use the Web like a single global database.
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  • 13. Web APIs slice the Web into separate data silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY
  • 14. What do we want? Use the Web as a single global database using what we know works on the Web
  • 15. Connecting Worlds One Web! Data Documents
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  • 26. The RDF Data Model Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri
  • 27. Data objects are identified with HTTP URIs pd:cygri Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri = http://richard.cyganiak.de/foaf.rdf#cygri dbpedia:Berlin = http://dbpedia.org/resource/Berlin
  • 28. Follow Your Nose... Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject
  • 29. Dereferencing URIs over the Web Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type dbpedia:Hamburg dbpedia:Muenchen skos:subject skos:subject pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject
  • 30. Universal Connector <resourceB> rdfs:seeAlso <resourceA>
  • 31. Universal Connector <resourceB> rdfs:seeAlso <resourceA> foaf:Person rdf:type
  • 32. Take Care! <resourceB> owl:sameAs <resourceA>
  • 33. The Disco – Hyperdata Browser
  • 34.  
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  • 36. What of Web Services? “ Web APIs Are Just Web Sites” - Paul Downey Linked Data is exposed as (very simple) RESTful services
  • 37. What of RDF Stores? A triplestore is just a cache of a chunk of the Semantic Web Convenient for data merging, querying (SPARQL) and inference See also: Semantic Web Client Library
  • 38. What of the Real World? source: http://danbri.org/words/2008/04/15/300 based on timbl 1994
  • 39.
  • 40. LOD Datasets on the Web: May 2007
  • 41. LOD Datasets on the Web: August 2007
  • 42. LOD Datasets on the Web: February 2008
  • 43. LOD Datasets on the Web: September 2008
  • 44. LOD Datasets on the Web: March 2009
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  • 60. Example : First Pass @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix owl: <http://www.w3.org/2002/07/owl#> . @prefix x: <http://purl.org/stuff/astro#> . x:Megrez rdf:type x:A3_dwarf ; x:magnitude &quot;3.1&quot; ; x:partOf [ rdf:type x:Constellation ; x:hasName &quot;Ursa Major&quot; ] . (RDF Turtle/N3 Syntax)
  • 61. Example : Vocabulary @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . x:Star rdf:type rdfs:Class . x:Constellation rdf:type rdfs:Class . x:A3_Dwarf rdfs:subClassOf x:Star . x:magnitude rdf:type rdf:Property . x:partOf rdf:type rdf:Property . x:hasName rdf:type rdf:Property .
  • 62.
  • 63. Example : Better Linkage @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . @prefix astro: <http://archive.astro.umd.edu/ont/astronomy.owl#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix dolce: <http://www.loa-cnr.it/ontologies/DOLCE-Lite.owl#> . @prefix dbpedia: <http://dbpedia.org/resource/> . dbpedia:Delta_Ursae_Majoris rdf:type x:A3_Dwarf ; foaf:name &quot;Megrez&quot;; x:magnitude &quot;3.1&quot; ; dolce:part-of dbpedia:Ursa_Major ; rdfs:seeAlso <http://www.dcs.gla.ac.uk/workshops/semast09> . dbpedia:Ursa_Major rdf:type astro:Constellation .
  • 64.
  • 65. New Vocabularies : voiD Vocabulary of Interlinked Datasets Classes: Dataset | Linkset | TechnicalFeature | Properties: statItem | feature | subset | target | sparqlEndpoint | linkPredicate | exampleResource | vocabulary | subjectsTarget | objectsTarget | dataDump | uriLookupEndpoint | uriRegexPattern |
  • 66. New Vocabularies : Scovo Statistical Core Vocabulary
  • 67. &quot;It is important to look as it as an interconnection bus, and it hasn't started working in earnest until one person's data is being used by some other unplanned use. This unexpected reuse is the measure.&quot; - Tim Berners-Lee, re. State of the Semantic Web Finishing Quotes
  • 68. &quot;Engineer for serendipity.&quot; - Roy T. Fielding, re. REST Finishing Quotes