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Webofdata

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GIven to the Edinburgh Tech Meetup on 8 July 2009. A quick introduction to how to publish linked data on the web.

GIven to the Edinburgh Tech Meetup on 8 July 2009. A quick introduction to how to publish linked data on the web.

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  • 1. Getting started with the web of data Bill Roberts bill@swirrl.com http://www.swirrl.com http://webofdatablog.com
  • 2. What is the web of data? Tom Coates: “A web of data sources, services for exploring and manipulating data, and ways that users can connect them together”
  • 3. Linked data “a method of exposing, sharing, and connecting data via dereferenceable URIs on the Web” http://wikipedia.org/Linked_data
  • 4. Linked data principles From Sir TimBL: 1. Use URIs as names for things 2. Use HTTP URIs so that people can look up those names 3. When someone looks up a URI, provide useful information, using the standards 4. Include links to other URIs so that they can discover more things
  • 5. http://www.readwriteweb.com/archives/interview_with_tim_b erners-lee_part_1.php
  • 6. Why publish linked data on the web? • Be found by your customers • Because it’s your mission • As part of academic publishing • As a paid-for service • Complement your main product or service • Build a reputation or brand
  • 7. Who’s doing it?
  • 8. How do you find it? • Sindice • Yahoo SearchMonkey • Google Rich Snippets • Following links • Data mashups/aggregators • SPARQL
  • 9. How to get started? Tom Scott of the BBC: ”...for those considering the Linked Data approach we’d say that 95% of the work is work you should be doing just to build for the (non-semantic) web. Get the fundamentals right and the leap to the Semantic Web is really more of a hop.”
  • 10. Resource Description Framework Subject/predicate/object (= Thing/attribute/value) “Bill’s e-mail address is bill@swirrl.com” Bill bill@swirrl.com e-mail address
  • 11. Everything gets a URI http://swirrl.com/ mailto:bill@swirrl.com bill.rdf#me http://xmlns.com/foaf/0.1/mbox <rdf:RDF xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#”> <foaf:Person rdf:about="http://swirrl.com/bill.rdf#me"> <foaf:mbox rdf:resource=“mailto:bill@swirrl.com”> </foaf:Person> Don’t worry about the XML stuff: it’s just circles and arrows!
  • 12. Everything gets a URI http://swirrl.com/ foaf:Person bill.rdf#me rdf:type <rdf:RDF xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#”> <foaf:Person rdf:about="http://swirrl.com/bill.rdf#me"> <foaf:mbox rdf:resource=“mailto:bill@swirrl.com”> </foaf:Person>
  • 13. Ontologies • Use existing ones where possible • Extend if you have to • Make your own if you really have to – People: Friend of a Friend (FOAF) – People/companies: vCard – Dates: iCal – Authors, titles, etc: Dublin Core – E-Commerce: GoodRelations – Places: Geonames – Projects: Description of a Project (DOAP)
  • 14. Publish for people AND machines URI for a real thing: http://dbpedia.org/resource/Edinburgh HTML representation: http://dbpedia.org/page/Edinburgh RDF representation: http://dbpedia.org/data/Edinburgh.xml
  • 15. Content negotiation DBPedia Tell me about resource/Edinburgh (in HTML) 303 redirect to …/page/Edinburgh Ok give me …/page/Edinburgh HTML file
  • 16. Content negotiation curl –v –H “Accept: application/rdf+xml” http://dbpedia.org/resource/Edinburgh Tell me about Edinburgh (in RDF) DBPedia 303 redirect to …/data/Edinburgh.xml Ok give me the data RDF+XML file
  • 17. RDFa • Mix the HTML and RDF markup in one file. +ve: simpler as only one file -ve: sometimes you want to include data that doesn’t really fit the HTML structure +ve: Google and Yahoo can use it (or at least some of it)
  • 18. Tools • Validators – w3.org/RDF/Validator • Client libraries and frameworks - Jena • RDF databases - Sesame • Platforms – Talis
  • 19. Looking for data publishing pilot studies… <rdf:Description rdf:about="http://dbpedia.org/resourc e/Guinea_pig_breed"> <skos:subject rdf:resource="http://dbpedia.org/reso urce/Category:Guinea_pigs"/> </rdf:Description> http://www.flickr.com/photos/mjjames/2767817164/
  • 20. Useful links Tom Coates “Native to a web of data” http://www.plasticbag.org/files/native/ Linked Data: http://www.linkeddata.org RDF primer http://www.w3.org/TR/rdf-primer/ RDFa primer http://www.w3.org/TR/xhtml-rdfa-primer/ Berners-Lee “Linked data – design issues” http://www.w3.org/DesignIssues/LinkedData.html Berners-Lee “Putting government data online” http://www.w3.org/DesignIssues/GovData.html Tom Scott “Building coherence at bbc.co.uk” http://blogs.talis.com/nodalities/2009/01/building-coherence-at-bbccouk.php RDF Validator http://www.w3.org/RDF/Validator/ Sesame RDF database http://www.openrdf.org Jena – Semantic web framework for Java http://jena.sourceforge.net/ Talis Platform http://www.talis.com/platform/ Yahoo SearchMonkey http://developer.yahoo.com/searchmonkey/ Google Rich Snippets http://www.google.com/support/webmasters/bin/answer.py?answer=99170
  • 21. Thanks! http://www.slideshare.net/billroberts/webofdata