Presentation done at the Paris City Hall on june 23th

1. Linked Data for Open Cities Loïc DIAS DA SILVA [email_address] http://parisemantique.fr is your data 5 ? Amsterdam Barcelona Berlin Paris

2. - deeply passionate about the web, its history, its future.. - software engineer, GNU/Linux addict - responsible for the API team in Viadeo ( http://www.viadeo.com ) - not a designer (as you will see soon..) - semantic web evangelist, open-source software user - created some weeks ago the webapp http://parisemantique.fr

4. WEB before ~2000 the document web

5. webmasters readers HTML Netscape unidirectional to link documents

6. WEB '2.0' the social web

7. user-centric prosumers crowd sourcing participation friends sharing media to link people API

8. Web of Data use-case

9. http://www.dltk-teach.com/rhymes/sleeping-beauty/story.htm The nicer story i've never read ! I want more !

10. I want more ! OK !

11. http://www.imdb.com/title/tt1588398/ ?!?!?! Highly ranked !

12. http://www.rcpsych.ac.uk/mentalhealthinfoforall/problems/sleepproblems/sleepingwell.aspx ???? Recommended to you

14. :~(

15. = ?

16. ok !

17. media suitable for little girls searching for princess stories ...

18. Web of Data

19. to link knowledge

20. <subject> <verb> <complement> a unit of information can be atomicized : as of RDF vocabulary : <subject> <predicat> <object> an RDF triple

21. [<subject>] [<predicat>] [<object>] ” lorem ipsum” lang type all is UR I

22. <subject> <predicat> <object> express the semantics using ontologies FRBR

23. [<subject>] [<predicat>] [<object>] Loïc ” is a” person < http://www.viadeo.com/r/profile/ 002l8n979djxjeg> < http://www.w3.org/1999/02/22-rdf-syntax-ns# type> viadeoprofile: 002l8n979djxjeg < http://xmlns.com/foaf/0.1/ Person> rdf: type foaf: Person

24. owl: sameAs rdf: type foaf: interests (foaf: interests) dc: creator (rdf: type) foaf: knows owl: sameAs (foaf: knows) foaf: name foaf: nickname viadeoprofile :loic.diasdasilva facebook :loic.diasdasilva foaf: Person wikipedia: Semantic_Web foaf: Person foaf: Person w3cpeople :Berners-Lee viadeoprofile :jean-philippe.clement1 twitter :opendataParis ” Loïc DIAS DA SILVA” ” Mglcel”

29. SPARQL PREFIX pswcity: <http://purl.org/psw/city/0.1/#> SELECT DISTINCT ?name ?add_number ?add_wayname WHERE { ?s pswcity:name ?name . ?s pswcity:address ?address. ?address pswcity:address_number ?add_number . ?address pswcity:in_way ?way. ?way pswcity:fullName ?add_wayname . FILTER ( ?s = <http://parisemantique.fr/entities/School/ecole_elementaire_9_rue_de_la_plaine>) . }

31. Use HTTP URI s so that these things can be referred to and looked up (&quot;dereferenced&quot;) by people and user agents.

32. Provide useful information about the thing when its URI is dereferenced, using standard formats such as RDF/XML.

33. Include links to other, related URIs in the exposed data to improve discovery of other related information on the Web.

34. “ Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/”

37. ? ? ? ?

52. A big work has to be done in order to semantize current data : - Different values for identifiation, ex Districts: '20e', 'XXe', '75020', 'PARIS 20', street names, etc.. - Many datasets not documented, semantization = meaning, is difficult - Some cells containing differently formatted values, multiple lines on multiple cells - ~80% of ESRI geo data without metadata Two main issues to resolve : Objects identification Types determination

54. ★ make your stuff available on the Web (whatever format) under an open license ★★ make it available as structured data (e.g., Excel instead of image scan of a table) ★★★ use non-proprietary formats (e.g., CSV instead of Excel) ★★★★ use open standards from W3C (RDF and SPARQL) to identify things, so that people can point at your stuff ★★★★★ link your data to other data to provide context http://www.w3.org/DesignIssues/LinkedData.html TBL : << The Semantic Web isn't just about putting data on the web. It is about making links, so that a person or machine can explore the web of data. With linked data, when you have some of it, you can find other, related, data. Like the web of hypertext, the web of data is constructed with documents on the web. However, unlike the web of hypertext, where links are relationships anchors in hypertext documents written in HTML, for data they links between arbitrary things described by RDF,. The URIs identify any kind of object or concept. But for HTML orRDF, the same expectations apply to make the web grow >>

55. Linked Open Cities proposal standard machine-readable material shared semantics semantic web

57. unique identifiers for each object in each city

58. clear object types

59. clearly identified data (not mixed in a single field for instance)

60. clear data types (integers, enums, dates, strings [names, titles, ..], years, standard units) proposal

62. links inside texts, between objects

63. one page for each object

64. begin to find links to related content from other open cities or media repositories proposal

66. a shared sub-ontology for common concepts

67. a specific sub-ontology per city for dedicated concepts

68. RDF transformation of the data

69. industrialize the linking of objects (In & Out)

70. SPARQL endpoint opening

71. No need for specific API (but already possible) ! proposal

72. Thanks for you attention ! So, will your data be 5 ?