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Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston  Technical Researcher, E...
Document Web Principles• Use URIs as names of documents• Use http URIs, so that people can use HTTP protocol to  look up t...
Use URIs as names of documents   http://en.wikipedia.org/wiki/D.H._Lawrence
Use http URIs…   http://en.wikipedia.org/wiki/D.H._Lawrence
Provide the documents
Use document standards
Include links to other docs                 • Links typically “untyped”                 <a href="/wiki/Eastwood,_Nottingha...
(*) On “providing the document”: content negotiation• Client HTTP request for doc includes info about  preferences, e.g.  ...
Linked Data Principles (a version!)• Use URIs as names of things   • people, places, concepts, documents… anything!   • (a...
Linked Data Principles (a version!)   Use data standards: RDF   Include typed links to other things      so that people...
Use URIs as names of things   http://dbpedia.org/resource/D.H._Lawrence
Use http URIs…  http://dbpedia.org/resource/D.H._Lawrence
Provide documents about those things…                      Thing:   http://dbpedia.org/resource/D.H._Lawrence             ...
…with representations suitable for people…
…and representations suitable for programs
Use data standards: RDF• A way to model data• Assertions of relationships between two things• Triples: subject, predicate,...
Use data standards: RDF• Triples: use URIs as “words”/names       <http://dbpedia.org/resource/D._H._Lawrence>       <http...
Use data standards: RDF• Extensibility of vocabulary• Reuse of vocabulary• “Self-description”   • vocabulary terms describ...
Include typed links to other thingsdbpedia:D._H._Lawrence   dbp-owl:birthPlace       dbpedia:Eastwood,_Nottinghamshire ;  ...
“Linked data is data you can click on”            (?John Sheridan, National Archives)
Linked Data from British Library: D. H. Lawrence
Linked Data from OCLC VIAF: D. H. Lawrence
Linked Data from Freebase: D. H. Lawrence
Linked Data from BBC:Programmes related to D. H. Lawrence
Archives Hub EAD data: D. H. Lawrence letters
Sindice/Sig.ma: RDF data aggregator/search
RDF & Linked Data: some strengths/features• Designed for the Web, “open world”   • Anyone can say anything about anything ...
RDF & Linked Data: Some challenges   New concepts, formats, tools   (Re)modelling/migration/conversion   Linking & iden...
How?•   Model our “world”•   Design URI patterns•   Select/create RDF vocabularies•   Convert/transform data•   Generate l...
Acknowledgements / some useful sources• Tom Heath & Chris Bizer, Linked Data: Evolving the Web into a Global Data  Space  ...
Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston  Technical Researcher, E...
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Linked Data: A short(-ish) introduction

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A short introduction to Linked Data, for project meeting of Bricolage project, ILRT, Bristol, Thursday 26 Jan 2012

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Transcript of "Linked Data: A short(-ish) introduction"

  1. 1. Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston Technical Researcher, Eduserv pete.johnston@eduserv.org.uk
  2. 2. Document Web Principles• Use URIs as names of documents• Use http URIs, so that people can use HTTP protocol to look up those names• When someone looks up a URI, provide the document (*)• Use document standards, e.g. HTML• Include links to other documents, so that people can discover more documents
  3. 3. Use URIs as names of documents http://en.wikipedia.org/wiki/D.H._Lawrence
  4. 4. Use http URIs… http://en.wikipedia.org/wiki/D.H._Lawrence
  5. 5. Provide the documents
  6. 6. Use document standards
  7. 7. Include links to other docs • Links typically “untyped” <a href="/wiki/Eastwood,_Nottinghamshire" title="Eastwood, Nottinghamshire">Eastwood</a> <a href="/wiki/Lady_Chatterley%27s_Lover" title="Lady Chatterleys Lover">Lady Chatterleys Lover</a> <a href="/wiki/Joseph_Conrad" title="Joseph Conrad">Joseph Conrad</a>  Occasionally “typed” <link rel="copyright“ href=“http://creativecommons.org/licenses/by-sa/3.0/" />
  8. 8. (*) On “providing the document”: content negotiation• Client HTTP request for doc includes info about preferences, e.g. • Language (Prefer English, but will accept Spanish) • Media-type (Prefer XHTML, but will accept HTML, plain text)• Server responds with representation of doc which best matches preferences
  9. 9. Linked Data Principles (a version!)• Use URIs as names of things • people, places, concepts, documents… anything! • (avoid URI ambiguity)• Use http URIs so that people and programs can look up those names• When a person or program looks up a name, provide (representations of) documents about the things
  10. 10. Linked Data Principles (a version!) Use data standards: RDF Include typed links to other things  so that people and programs can discover other things
  11. 11. Use URIs as names of things http://dbpedia.org/resource/D.H._Lawrence
  12. 12. Use http URIs… http://dbpedia.org/resource/D.H._Lawrence
  13. 13. Provide documents about those things… Thing: http://dbpedia.org/resource/D.H._Lawrence Document: http://dbpedia.org/page/D.H._Lawrence
  14. 14. …with representations suitable for people…
  15. 15. …and representations suitable for programs
  16. 16. Use data standards: RDF• A way to model data• Assertions of relationships between two things• Triples: subject, predicate, object DH Lawrence has-notable-work Lady Chatterleys Lover
  17. 17. Use data standards: RDF• Triples: use URIs as “words”/names <http://dbpedia.org/resource/D._H._Lawrence> <http://dbpedia.org/ontology/notableWork> <http://dbpedia.org/resource/Lady_Chatterley%27s_ Lover>• In RDF syntaxes, URIs often abbreviated • dbpedia:D._H._Lawrence
  18. 18. Use data standards: RDF• Extensibility of vocabulary• Reuse of vocabulary• “Self-description” • vocabulary terms described using RDF• Rules for data merging/integration• “Formal semantics”, basis for inferencing
  19. 19. Include typed links to other thingsdbpedia:D._H._Lawrence dbp-owl:birthPlace dbpedia:Eastwood,_Nottinghamshire ; dbp-owl:notableWork dbpedia:Lady_Chatterley%27s_Lover ; dbp-owl:influencedBy dbpedia:Joseph_Conrad .
  20. 20. “Linked data is data you can click on” (?John Sheridan, National Archives)
  21. 21. Linked Data from British Library: D. H. Lawrence
  22. 22. Linked Data from OCLC VIAF: D. H. Lawrence
  23. 23. Linked Data from Freebase: D. H. Lawrence
  24. 24. Linked Data from BBC:Programmes related to D. H. Lawrence
  25. 25. Archives Hub EAD data: D. H. Lawrence letters
  26. 26. Sindice/Sig.ma: RDF data aggregator/search
  27. 27. RDF & Linked Data: some strengths/features• Designed for the Web, “open world” • Anyone can say anything about anything • No-one says everything about anything• Extensible, decentralised• Rules for data merging/integration• Inferencing
  28. 28. RDF & Linked Data: Some challenges New concepts, formats, tools (Re)modelling/migration/conversion Linking & identity Versioning & time Trust
  29. 29. How?• Model our “world”• Design URI patterns• Select/create RDF vocabularies• Convert/transform data• Generate links• Publish/expose data
  30. 30. Acknowledgements / some useful sources• Tom Heath & Chris Bizer, Linked Data: Evolving the Web into a Global Data Space http://linkeddatabook.com/• Yves Raimond & Michael Smethurst, “A skim-read introduction to linked data” http://www.bbc.co.uk/blogs/radiolabs/s5/linked-data/s5.html• Dave Reynolds, “Linked data and its role in the semantic web” http://www.slideshare.net/der42/introduction-to-linked-data-and-the-semantic- web-8700415
  31. 31. Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston Technical Researcher, Eduserv pete.johnston@eduserv.org.uk
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