presented at Practical Semantic Astronomy 2009

2. Obligatory Children Slide

7. Classic Data : in silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY

9. What do we actually want? Use the Web like a single global database.

11. Web APIs

13. Web APIs slice the Web into separate data silos Image: Bob Jagensdorf, http://flickr.com/photos/darwinbell/, CC-BY

14. What do we want? Use the Web as a single global database using what we know works on the Web

15. Connecting Worlds One Web! Data Documents

26. The RDF Data Model Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri

27. Data objects are identified with HTTP URIs pd:cygri Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri = http://richard.cyganiak.de/foaf.rdf#cygri dbpedia:Berlin = http://dbpedia.org/resource/Berlin

28. Follow Your Nose... Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject

29. Dereferencing URIs over the Web Richard Cyganiak dbpedia:Berlin foaf:name foaf:based_near foaf:Person rdf:type dbpedia:Hamburg dbpedia:Muenchen skos:subject skos:subject pd:cygri dp:Cities_in_Germany 3.405.259 dp:population skos:subject

30. Universal Connector <resourceB> rdfs:seeAlso <resourceA>

31. Universal Connector <resourceB> rdfs:seeAlso <resourceA> foaf:Person rdf:type

32. Take Care! <resourceB> owl:sameAs <resourceA>

33. The Disco – Hyperdata Browser

36. What of Web Services? “ Web APIs Are Just Web Sites” - Paul Downey Linked Data is exposed as (very simple) RESTful services

37. What of RDF Stores? A triplestore is just a cache of a chunk of the Semantic Web Convenient for data merging, querying (SPARQL) and inference See also: Semantic Web Client Library

38. What of the Real World? source: http://danbri.org/words/2008/04/15/300 based on timbl 1994

40. LOD Datasets on the Web: May 2007

41. LOD Datasets on the Web: August 2007

42. LOD Datasets on the Web: February 2008

43. LOD Datasets on the Web: September 2008

44. LOD Datasets on the Web: March 2009

51. Tabulator

55. Falcons

59. Example : Source Data

60. Example : First Pass @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix owl: <http://www.w3.org/2002/07/owl#> . @prefix x: <http://purl.org/stuff/astro#> . x:Megrez rdf:type x:A3_dwarf ; x:magnitude &quot;3.1&quot; ; x:partOf [ rdf:type x:Constellation ; x:hasName &quot;Ursa Major&quot; ] . (RDF Turtle/N3 Syntax)

61. Example : Vocabulary @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . x:Star rdf:type rdfs:Class . x:Constellation rdf:type rdfs:Class . x:A3_Dwarf rdfs:subClassOf x:Star . x:magnitude rdf:type rdf:Property . x:partOf rdf:type rdf:Property . x:hasName rdf:type rdf:Property .

63. Example : Better Linkage @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix x: <http://purl.org/stuff/astro#> . @prefix astro: <http://archive.astro.umd.edu/ont/astronomy.owl#> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix dolce: <http://www.loa-cnr.it/ontologies/DOLCE-Lite.owl#> . @prefix dbpedia: <http://dbpedia.org/resource/> . dbpedia:Delta_Ursae_Majoris rdf:type x:A3_Dwarf ; foaf:name &quot;Megrez&quot;; x:magnitude &quot;3.1&quot; ; dolce:part-of dbpedia:Ursa_Major ; rdfs:seeAlso <http://www.dcs.gla.ac.uk/workshops/semast09> . dbpedia:Ursa_Major rdf:type astro:Constellation .

65. New Vocabularies : voiD Vocabulary of Interlinked Datasets Classes: Dataset | Linkset | TechnicalFeature | Properties: statItem | feature | subset | target | sparqlEndpoint | linkPredicate | exampleResource | vocabulary | subjectsTarget | objectsTarget | dataDump | uriLookupEndpoint | uriRegexPattern |

66. New Vocabularies : Scovo Statistical Core Vocabulary

67. &quot;It is important to look as it as an interconnection bus, and it hasn't started working in earnest until one person's data is being used by some other unplanned use. This unexpected reuse is the measure.&quot; - Tim Berners-Lee, re. State of the Semantic Web Finishing Quotes

68. &quot;Engineer for serendipity.&quot; - Roy T. Fielding, re. REST Finishing Quotes

69. http://hyperdata.org/astronomy/ Related Links etc.