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Very Gentle Linked Data Workshop
The document outlines a workshop on linked data conducted by Adrian and Jane Stevenson at the University of Manchester, focusing on sharing structured data on the web. Key topics include RDF modeling, serialization formats like n-triples and turtle, and using SPARQL for querying. Additional resources and tools for practical applications of linked data were also discussed, alongside hands-on sessions and real-life examples.
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Very Gentle Linked Data Workshop
- 1. ELAG 2013 Workshop.Ghent, 29–30th May 2013 Adrian Stevenson and Jane Stevenson Mimas, University of Manchester, UK @adrianstevenson @janestevenson Very Gentle Linked Data
- 2. Workshop Resources • Allworkshop resources available from: http://bit.ly/verygentle • Web address for resources in footer of each slide Workshop resources at http://bit.ly/verygentle 2
- 3. Day 1 Workshop resourcesat http://bit.ly/verygentle 3
- 4. The goal ofLinked Data is to enable people to share structured data on the Web as easily as they can share documents today. Bizer/Cyganiak/Heath Linked Data Tutorial, linkeddata.org
- 5. RDF Modelling –Pride and Prejudice Workshop resources at http://bit.ly/verygentle 5
- 6. Linked Data DesignIssues • URIs • LD Design Issues • Triples http://www.w3.org/DesignIssues/LinkedData.html
- 7. Triples • Triples statements –‘Things’ have ‘properties’ with ‘values’ – Subject – Predicate - Object • Triples are the basis of RDF and Linked Data Archival Resource Repository Provides Access To Pride and Prejudice Jane Austen Is Author Of
- 8. Archival Resource Finding Aid EAD Document Biographical History Agent FamilyPerson Place Concept Genre Function Organisation maintainedBy/ maintains origination associatedWith accessProvidedBy/ providesAccessTo topic/ page hasPart/ partOf hasPart/ partOf encodedAs/ encodes Repository (Agent) Book Place topic/ page Language Level administeredBy/ administers hasBiogHist/ isBiogHistFor foaf:focusIs-a associatedWith level Is-a language Concept Scheme inScheme Object representedBy Postcode Unit Extent Creation Birth Death extent participates in Temporal Entity Temporal Entity at time at time product of in Archives Hub Model
- 9. Workshop resources athttp://bit.ly/verygentle 9
- 10. URIs, Vocabs, Ontologies •Need HTTP URIs for things to make links • Objects can be literal values – text, numbers • It’s important to state the type of resource – RDF Syntax provides rdf:type – Rdf:type used with classes e.g. bibo:Book, – dct:BibliographicResource • Labels are very useful! – RDF Schema provides rdfs:label, rdfs:comment Workshop resources at http://bit.ly/verygentle 10
- 11. Paper to machine- Serialisation • Storing RDF in files is serialisation • Various forms for serialisation – N-triples, Turtle and RDF/XML – Notation 3 (N3) and RDFa • Today we’ll be looking at n-triples and Turtle • RDF/XML quite complex and hard to read, but tools available to convert between formats Workshop resources at http://bit.ly/verygentle 11
- 12. Turtle • Semicolon -another predicate and object coming for the same subject. The final object needs a dot (period) after it. • Comma - the next triple has the same subject and predicate. The final object needs a dot (period) after it. Workshop resources at http://bit.ly/verygentle 12
- 13. Hands on sessionwriting n-triples and Turtle Workshop resources at http://bit.ly/verygentle 13
- 14. Real Life LinkedData • Transformation – Often using XSLT –MARC to RDF, MODS to RDF, EAD to RDF • Matching Tools – SILK Framework • http://wifo5-03.informatik.uni- mannheim.de/bizer/silk/ Workshop resources at http://bit.ly/verygentle 14
- 15. Day 2 Workshop resourcesat http://bit.ly/verygentle 15
- 16. Storing RDF -Triple Stores • What? - a store for your triples! • Why? - efficiency – indexing • Useful for producing Linked Data views • Provides SPARQL endpoint that accepts queries and returns results over HTTP (i.e. the Web!). • Results usually returned in ‘SPARQL Query Results’ XML format • Many stores present results in user friendly form Workshop resources at http://bit.ly/verygentle 16
- 17. Running Fuseki TripleStore • Now we’ll aim to run a Fuseki triple store on your laptops • If wifi working, all SPARQL examples should work with the British Library SPARQL endpoint: – http://bnb.data.bl.uk/sparql • …BUT! You’ll need to LIMIT your queries Workshop resources at http://bit.ly/verygentle 17
- 18. Querying RDF -SPARQL • A SPARQL query comprises, in order: – Prefix declarations, for abbreviating URIs – A result clause, identifying what information to return from the query – The query pattern, specifying what to query for in the underlying dataset – Query modifiers, slicing, ordering, and otherwise rearranging query results Workshop resources at http://bit.ly/verygentle 18
- 19. SPARQL Query • #prefix declarations PREFIX dct: <http://purl.org/terms/dc> ... # result clause SELECT ... # query pattern WHERE { ... } # query modifiers ORDER BY ... Workshop resources at http://bit.ly/verygentle 19
- 20. Hands on SPARQLSession Workshop resources at http://bit.ly/verygentle 20
- 21. Linked Data Views •Can use tools to provide Linked Data Views – Pubby • http://wifo5-03.informatik.uni-mannheim.de/pubby/ – ELDA • https://code.google.com/p/elda/ • Views important for making Linked Data de- referenceable and crawlable. Workshop resources at http://bit.ly/verygentle 21
- 22. Workshop resources athttp://bit.ly/verygentle 22
- 23. Workshop resources athttp://bit.ly/verygentle 23
- 24. Building Applications onLinked Data • We have explained today how to publish RDF and Linked Data • The next step is to build applications using it • BBC is probably the best example • We’ve been working on Linking Lives project – http://archiveshub.ac.uk/linkinglives/ Workshop resources at http://bit.ly/verygentle 24
- 25. Martha Beatrice Webb Placeof birth: Gloucester, England Place of death: Liphook, Hampshire, Englan d Life dates: 1858-1943 Epithet: social reformer and historian Family name: Webb Image from: Beatrice Webb letters Beatrice Webb (1858 - 1943). Fabian Socialist, social reformer, writer, historian, diarist. Wife, collaborator and assistant of Sidney Webb, later Lord Passfield. Together they contributed to the radical ideology first of the Liberal Party and later of the Labour Party. from: Beatrice Webb, A summer holiday in Scotland, 1884. Beatrice Webb (1858-1943), nee Potter, social reformer and diarist. Married to Sidney Webb, pioneers of social science. She was involved in many spheres of political and social activity including the Labour Party, Fabianism, social observation, investigations into poverty, development of socialism, the foundation of the National Health Service and post war welfare state, the London School of Biographical Notes Works Our Partnership My Apprenticeship The case for the factory acts Beatrice Webb’s diaries; edited by Margaret Cole The Diary Knows http://dbpedia.org/page/George_Bernard_Shaw http://dbpedia.org/page/Sidney_Webb,_1st_Bar on_Passfield
- 26. Contacts 26 Adrian Stevenson andJane Stevenson Mimas, University of Manchester, UK [email protected] [email protected] www.mimas.ac.uk www.twitter.com/adrianstevenson www.twitter.com/janestevenson Workshop resources at http://bit.ly/verygentle
- 27. CC License This presentationavailable under creative commons Non Commercial-Share Alike: http://creativecommons.org/licenses/by-nc/2.0/uk/ Workshop resources at http://bit.ly/verygentle 27
Editor's Notes
- #5 Has been described as a ‘data commons’, or more usually a Web of Data.
- #7 http://www.w3.org/DesignIssues/LinkedData.html
- #9 Note these are now abstracted from the particular instances
- #26 Mock-up of the LInking Lives interface shows the way data is brought together.