1.
Linked Datalife cycles<br />Dr. Michael Hausenblas, Linked Data Research CentreDERI, NUI Galway<br />July 2011<br />

2.
What is a dataspace?<br />Heterogeneous data sources<br />Distributed environment - proximity<br />Find and consume data<br />Update data<br />

3.
What is a DSSP and why does it matter?<br />DSSP == Dataspace Support Platform<br />Participants & relationships<br />Services<br />Catalog & Browse<br />Search & Query<br />Index<br />Discovery<br />Linked Data ecosystem is an open & standards-basedreal-world DSSP<br />

4.
Data management solutions<br />Based on [Franklin:SIGMOD05]<br />

5.
Linked Data principles*<br />Use URIs to identify the “things” in your data<br />Use HTTP URIs so people and machines can look them up (on the Web)<br />When a URI is looked up, return a description of the thing<br />Include links to related things<br />* http://www.w3.org/DesignIssues/LinkedData.html<br />

6.
http://lod-cloud.net/<br />Linked Open Data cloud<br />

7.
Linked Open Data cloud stats<br />triples distribution<br />links distribution <br />http://lod-cloud.net/state/<br />

8.
The Challenge<br /><ul><li>Classical data management approaches assume complete control over schema, data, and data generation

9.
The Web: distributed & open  lacks control

10.
Requires a new model of life cycles</li></li></ul><li>Linked Data life cycles<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

11.
Linked Data life cycles: data awareness<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

12.
http://thinkquarterly.co.uk/01-data/a-data-state-of-mind/<br />Hans Rosling <br />‘database hugging disorder’<br />

13.
TimBL’s 5-star plan for open data*<br />★ Make your data available on the Web under an open license<br /> ★★ Make it available as structured data(Excel sheet instead of image scan of a table) <br /> ★★★Use a non-proprietary format(CSV file instead of an Excel sheet) <br />★★★★ Use Linked Data format(URIs to identify things, RDF to represent data)<br />★★★★★ Link your data to other people’s data to provide context<br />*http://lab.linkeddata.deri.ie/2010/star-scheme-by-example/<br />

14.

15.
Linked Data life cycles: modeling<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

16.
http://linked-statistics.org/datacube/<br />

17.
http://vocab.deri.ie<br />http://neologism.deri.ie<br />

18.
http://schema.rdfs.org<br />

19.
Linked Data life cycles: publishing<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

20.
Publishing<br />http://lab.linkeddata.deri.ie/2010/grefine-rdf-extension/<br />

21.
Linked Data life cycles: discovery<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

22.
Discovery<br />Model for dataset description: VoID vocabulary<br />Users in industry and governments<br />Published as W3C Notehttp://www.w3.org/TR/void<br />Significant uptake in research<br />

23.
Describing Datasets<br />General dataset metadata<br />Access metadata<br />Structural metadata<br />Describing linksets<br />Deployment and discovery of voiD files<br />

24.
Linked Data life cycles: integration<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

25.
Why going for the 5th star?<br />Central Contractor Registration (CCR) <br />Geonames<br />http://webofdata.wordpress.com/2011/05/22/why-we-link/<br />

26.
Pay-as-you-go integration<br />Fix Overall Data IntegrationEffort<br />http://latc-project.eu/<br />

27.
Linked Data life cycles: use cases<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

28.
Use case: eGov Ireland<br />Fingal County Council<br />Raising awareness re open data and demonstrating its value.<br />ODC2011 submission http://planning-apps.opendata.ie<br />Local Government Management Agency (former LGCSB)<br />Advancing access to Open Data for Local Authorities <br />LD pilot for Management Service Indicators across Local Authorities<br />Central Statistics Office, dissemination group<br />Boot-strapping data-gov.ie with statistical data.<br />school explorer - pilot<br /><ul><li>Enterprise Ireland: National Cross Industry Working Group on Open Data</li></ul>27<br />

29.
School explorer<br />

30.
Linked Data life cycles<br />opendata.ie<br />LOD cloud <br />Neologism<br />DataCube<br />prefix.cc<br />Google Refine<br />RDB2RDF<br />VoID<br />DCAT<br />Sindice<br />CKAN<br />LATC 24/7<br />duke<br />Sig.ma<br />school explorer<br />data-gov.ie<br />

31.
Challenges<br />Schema mapping, matching, alignment[Hausenblas:DBKDA10]<br />Write-enable the LD world [Berners-Lee:DERITR09]<br />Authentication and authorisation in a distributed setuphttp://www.w3.org/2005/Incubator/webid/<br />REST-alignment of Linked Data[Wilde:WEWST09]<br />Dataset dynamics[Umbrich:LDOW10]<br />

32.
References<br />[Franklin:SIGMOD05] M. J. Franklin, A. Y. Halevy, and D. Maier, From databases to dataspaces: a new abstraction for information management.SIGMOD Record, 34(4):27–33, 2005.<br />[Berners-Lee:DERITR09] T. Berners-Lee, R. Cyganiak, M. Hausenblas, J. Presbrey, O. Seneviratne, and O. Ureche.<br /> On Integration Issues of Site-Specific APIs into the Web of Data. DERI Technical Report, 2009.<br />[Hausenblas:DBKDA10] M.Hausenblas and Marcel Karnstedt.Understanding Linked Open Data as a Web-Scale Database. Second International Conference on Advances in Databases, Knowledge, and Data Applications, 2010.<br />[Wilde:WEWST09] E. Wilde and M. Hausenblas.RESTful SPARQL? You Name It! Aligning SPARQL with REST and Resource Orientation. Fourth Workshop on Emerging Web Services Technology Workshop at European Conference on Web Services, Eindhoven, The Netherlands, 2009.<br />[Umbrich:LDOW10] J. Umbrich, M. Hausenblas, A. Hogan, A. Polleres, and S. Decker.Towards Dataset Dynamics: Change Frequency of Linked Open Data Sources. Third International Workshop on Linked Data on the Web at 19th International World Wide Web Conference, Raleigh, North Carolina, USA, 2010. <br />

33.
See also ...<br /><ul><li>The Linked Open Data cloudhttp://lod-cloud.net

34.
Linked Data core specificationshttp://linkeddata-specs.info

35.
Enabling cross-boundary access to data sourceshttp://enable-cors.org

36.
Linked Open Data 5-star deployment schemehttp://lab.linkeddata.deri.ie/2010/star-scheme-by-example/</li>