Gist od2-feb-2011

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Gist od2-feb-2011

  1. 1. Semantic Web Overview Open Data Group – 23 rd Feb 2011 @ianibbo This work is licensed under a Creative Commons Attribution 3.0 Unported License.
  2. 2. Overview <ul><li>Scene Setting </li><ul><li>Questions you should be able to answer at the end </li></ul><li>Major Aspects </li><ul><li>Conceptual Model and Vision </li><ul><li>The (Distributed) Graph Model </li></ul><li>Implementation </li><ul><li>Descriptions & Descriptive Bindings - RDF </li><ul><li>RDFXML, RDFa, n3, turtle, ntriples </li></ul><li>Storage
  3. 3. Retrieval </li><ul><li>SPARQL </li></ul></ul></ul></ul>
  4. 4. Scene Setting <ul><li>Semantic Web </li><ul><li>Whats it good for? </li><ul><li>Anyone can say anything – about anything (And thats a good thing?)
  5. 5. Ability to describe unforseen classes </li></ul><li>Whats it not good for? </li><ul><li>Tabular Data actually not so bad
  6. 6. Updating Tabular Data more of an issue
  7. 7. Frequent/atomic/isolated Updates (anecdotally)
  8. 8. Transactional Capabilities
  9. 9. Modern Search Capabilities – Spatial, Text, other.
  10. 10. Identity Generation </li></ul><li>How to know the difference?
  11. 11. Coordination is still needed – This is not a free-for-all – Honest!
  12. 12. Provenance of data sets (Resource provenance good) </li></ul></ul>
  13. 13. Conceptual Model - Examples <ul><li><ThisPresentation> <DeliveredBy> <Ian>
  14. 14. <Ian> <MemberOf> <GistFoundation>
  15. 15. <GistOpenDataMeetup2> <Date> '23-Feb-2011#date'
  16. 16. <Ian> <FavoriteDrink> <Moonshine>
  17. 17. <GISTLab> <MaxCapacity> '70#int'
  18. 18. <GISTLab> <Hosted > <GistOpenDataMeetup1>
  19. 19. <GISTLab> <Hosted > <GistOpenDataMeetup2>
  20. 20. <GISTLab> <Hosted> <GistOpenDataMeetup3> </li></ul>
  21. 21. Conceptual Model - Principles <ul><li>URI, URI, URI, URI
  22. 22. ISBN's, ISSNs - urn:issn:1535-3613
  23. 23. The description and the thing described are not the same thing </li><ul><li>Well known strategies for modelling. </li><ul><li><ian> == http://ianibbo.me
  24. 24. <ian> == http://ianibbo.me#me </li></ul></ul><li><Subject> <Predicate> <Object>
  25. 25. <URI> <URI> <URI|Literal> </li></ul>
  26. 26. Conceptual Model <ul><li>URI, URI, URI, URI
  27. 27. The description and the thing described are not the same thing </li><ul><li>Well known strategies for modelling. </li></ul><li><Subject> <Predicate> <Object> </li></ul>
  28. 28. Notes <ul><li>http://www.w3.org/2002/12/rdf-identifiers/ </li></ul>

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