Published on June 24, 2009
Leigh Dodds Programme Manager, Talis Platform Talis 25 th June 2009 http://creativecommons.org/licenses/by/2.0/uk/ An Introduction to Linked Data
Overview What is RDF? Historical Issues with the Semantic Web Linked Data The Linking Open Data Project Practical Steps Closing Points
What is RDF?
Historical Issues with the Semantic Web
The Linking Open Data Project
What Is RDF? http://www.flickr.com/photos/-bast-/349497988/
Apollo 11 was launched from Cape Canaveral
Apollo 11 was launched from Cape Canaveral Subject Predicate Object
<http://nasa.dataincubator.org/spacecraft/apollo-11> <http://purl.org/net/schemas/space/launchsite> <http://nasa.dataincubator.org/launchsite/capecanaveral>.
Why has it taken so long? http://www.flickr.com/photos/caitlinator/3009659704/
The Technology Problem
The Babel Problem
The AI Problem
Linked Data A grass roots approach http://www.flickr.com/photos/66164549@N00/2800038473
“ Linked Data is the Web done right” – Tim Berners-Lee
The Web of Documents Links Between Documents, not Things Data only loosely structured Meaning of links is implicit
Web 2.0 Web 2.0 Increasingly structured data Little linking between sites No standardization across APIs
Linked Data Standard Data Model Link together datasets across the web Add value through network effects
http://www.flickr.com/photos/fabiovenni/478239267/ The Linking Open Data Project
The LOD "Cloud" - May 2007
The LOD "Cloud" - July 2007
The LOD "Cloud" - August 2007
The LOD "Cloud" - November 2007
The LOD "Cloud" – Feb 2008
The LOD "Cloud" – Sept 2008
Practical Pointers A step-by-step approach to publishing Linked Data http://www.flickr.com/photos/visualpanic/2422742902
http://www.flickr.com/photos/kubina/941699149 Identify Your Data What might you usefully publish? Where is it stored? How is maintained?
Identify Your Data
What might you usefully publish?
Where is it stored?
How is maintained?
http://www.flickr.com/photos/tillwe/603936954 Identify Objects of Collective Interest Assign them a unique URL Ensure those URLs are stable Think about more than just “content” At this stage don't think about the user experience
Identify Objects of Collective Interest
Assign them a unique URL
Ensure those URLs are stable
Think about more than just “content”
At this stage don't think about the user experience
http://www.flickr.com/photos/wilhei/109404222/ Publish Human & Machine Readable Data A page for each object with human and machine-readable views RDFa can be used to embed data into HTML Provide links between objects
http://www.flickr.com/photos/uncommondepth/3204094812/ Ensure Licensing is Clear Creative Commons Open Data Licenses Attach licenses to content and data
Ensure Licensing is Clear
Open Data Licenses
Attach licenses to content and data
http://flickr.com/photos/bekathwia/2170338717 Link into the Web of Data Stitch your data into the Linked Data Cloud Use DbPedia as a linking hub
Additional Benefits Produces flexible, well-structured sites Search engine optimised Encourages reuse, linking
Produces flexible, well-structured sites
Search engine optimised
Encourages reuse, linking
Closing Points Linked Data is a natural evolution of the web Web of data is growing rapidly Need for more authoritative and quality sources http://www.flickr.com/photos/vshioshvili/2093112220
Further Reading Linked Data http://linkeddata.org Building coherence at bbc.co.uk http://derivadow.com/2009/01/30/building-coherence-at-bbccouk/ Your Website is Your API: Quick Wins for Government Data http://www.jenitennison.com/blog/node/100
Building coherence at bbc.co.uk
Your Website is Your API: Quick Wins for Government Data
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