Introducción a la web semántica - Linkatu - irekia 2012
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Introducción a la web semántica desde el punto de vista del periodismo de datos
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Introducción a la web semántica - Linkatu - irekia 2012
- 1. Linkatu: Linked data journalism Irekia, Bilbao 2012
- 4. “the value of your information grows exponentially with your ability to combine it with new information” – Henry Story, Sun Microsystems
- 13. BBC and Linked Data @metade
- 22. Document Book Novel Short story
- 29. RDF is a triple model i.e. every piece of knowledge is broken down into ( subject , predicate , object )
- 30. ( doc.html , author , Fabien ) ( doc.html , theme , Music ) ( subject , predicate , object )
- 32. http://en.wikipedia.org/wiki/Lion http://dbpedia.org/page/Lion
- 33. SPARQL stands for SPARQL Protocol and RDF Query Language
- 34. SPARQL query SELECT ... FROM ... WHERE { ... }
- 35. SELECT clause to identify the values to be returned
- 36. FROM clause to identify the data sources to query
- 37. WHERE clause the triple/graph pattern to be matched against the triples/graphs of RDF
- 38. WHERE clause a conjunction of triples: { ?x rdf:type ex:Person ?x ex:name ?name }
- 39. PREFIX to declare the schema used in the query
- 40. example persons and their names PREFIX ex: <http://inria.fr/schema#> SELECT ?person ?name WHERE { ?person rdf:type ex:Person ?person ex:name ?name . }
- 41. Example of result <?xml version="1.0"?> <sparql xmlns="http://www.w3.org/2005/sparql-results#" > <head> <variable name="person"/> <variable name="name"/> </head> <results ordered="false" distinct="false"> <result> <binding name="person"> <uri>http://inria.fr/schema#fg</uri> </binding> <binding name="name"> <literal>gandon</literal> </binding> </result> <result> ...
- 42. FILTER to add constraints to the graph pattern (e.g., numerical like X>17 )
- 43. example persons at least 18-year old PREFIX ex: <http://inria.fr/schema#> SELECT ?person ?name WHERE { ?person rdf:type ex:Person ?person ex:name ?name . ?person ex:age ?age . FILTER (?age > 17) }
- 47. what is a “data market place" ? Service that make it easy to find data from a range of secondary data sources, then consume the data in a usable and unified format. Several of these services are trying to create marketplaces for data, envisioning that data providers can offer their data sets for sale to data seekers
- 48. what is a "platform" ? a place where we encourage... support... enable... our communities
- 49. You own the data You control access You can pull it/change it You can delete it You can decide what is best