Graphity is a generic linked data platform that aims to simplify working with linked data by reducing data conversions and code complexity. It uses a RESTful API and RDF model to provide a unified approach, reusing components through a model that pushes abstractions and logic to RDF. This more generic design requires less code and is more reusable than traditional SQL and object-oriented approaches.

1. Graphity Generic Linked Data platform Do more with less!

2. Wulffmorgenthaler Danish comic strip since 2001

3. HeltNormalt Rebranding in 2011

4. Old codebase SQL arrays Request Response Objects

5. Model-View-Controller SQL Request Response Objects

6. Leaky abstractions

7. Incompatible APIs DataConversions(N) ≥ 2 × (N − 1) Number of data (model) conversions between source datastore and target datastore Custom code Bugs

8. Model mismatch DataConversions(N) = 2 × (N − 1) Custom code Bugs

9. Linked Data(sources) DataConversions(N) = 0

10. REST+RDF JAX-RS Jena Resource getURI() Request/Response Model @Path Property UriBuilder Literal

12. getModel()

13. exists()

14. describe()

15. authenticate()

16. authorize()

17. Linked Systems Request Response RDF

18. Unified model DataConversions(N) = 2

21. Generalize cases

22. Refactor to minimize

23. Inversion of control

24. Overload default behaviour

25. Codebase comparison Component Language # of files # of lines Language # of files # of lines HeltNormalt Old codebase Model SPARQL 89 5590 PHP 93 19325 Model (strips) 7 588 View XSLT 60 9293 PHP 67 2528 View (strips) 5 784 Controller PHP 65 4155 PHP 51 7625 Controller (strips) 1 32 Graphity Zend Framework Platform PHP 88 6043 PHP 284 50755

26. Server load

28. Filesystems

30. source

32. Analytics

33. Maps

34. Timelines/calendars

35. Real-time streams

36. Social widgets

38. Standard RDFizer interface

42. [email_address]

43. @pumba_lt

44. @seporaitis