Linked Data: A short(-ish) introduction
Upcoming SlideShare
Loading in...5
×
 

Linked Data: A short(-ish) introduction

on

  • 567 views

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

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

Statistics

Views

Total Views
567
Views on SlideShare
567
Embed Views
0

Actions

Likes
0
Downloads
4
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

CC Attribution License

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Linked Data: A short(-ish) introduction Linked Data: A short(-ish) introduction Presentation Transcript

  • Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston Technical Researcher, Eduserv pete.johnston@eduserv.org.uk
  • 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
  • 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,_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/" />
  • (*) 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
  • 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
  • Linked Data Principles (a version!) Use data standards: RDF Include typed links to other things  so that people and programs can discover other things
  • 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 Document: http://dbpedia.org/page/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, object DH Lawrence has-notable-work Lady Chatterleys Lover
  • 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
  • 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
  • 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 .
  • “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 • No-one says everything about anything• Extensible, decentralised• Rules for data merging/integration• Inferencing
  • RDF & Linked Data: Some challenges New concepts, formats, tools (Re)modelling/migration/conversion Linking & identity Versioning & time Trust
  • How?• Model our “world”• Design URI patterns• Select/create RDF vocabularies• Convert/transform data• Generate links• Publish/expose data
  • 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
  • Linked DataA short(-ish) introductionBricolage Project meeting, Bristol, 26 Jan 2012Pete Johnston Technical Researcher, Eduserv pete.johnston@eduserv.org.uk