SPARQL - Basic and Federated Queries

1. SPARQL - Query Basics and Federated Queries Knud Möller, Talis Systems Ltd. @knudmoeller 16 April 2012 Tutorial: Practical Cross-Dataset Queries on the Web of Data WWW2012, Lyon, France

2. What is SPARQL? • query language for RDF graphs (i.e., linked data) • get speciﬁc information out of a dataset (or several datasets) • “The SQL for the Web of Data” LQRA P S

3. History • 2004: work started on SPARQL • 2008: SPARQL 1.0 finished (W3C Rec) • 2009: work started on SPARQL 1.1 • 2012 (now): SPARQL 1.1 almost finished • soon: SPARQL 1.1 finished

4. SPARQL Endpoint SPARQL Endpoint Query in Result back

5. PREFIX mo: <http://purl.org/ontology/mo/> PREFIX dce: <http://purl.org/dc/elements/1.1/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?album ?title ?release_date WHERE { ! ?album a mo:Record ; ! ! dce:date ?release_date ; ! ! dce:title ?title . ! FILTER (year(?release_date) = 2007 && month(?release_date) = 7) } ORDER BY ?release_date

6. SPARQL in a Nutshell 1 query clause 2 WHERE clause

7. SPARQL in a Nutshell What do I want to get back? • SELECT: list of things • DESCRIBE: RDF graph for one resource • CONSTRUCT: custom RDF graph 1 query clause • ASK: boolean value (true or false) 2 WHERE clause

8. SPARQL in a Nutshell What do I want to get back? • SELECT: list of things • DESCRIBE: RDF graph for one resource • CONSTRUCT: custom RDF graph 1 query clause • ASK: boolean value (true or false) 2 WHERE clause Which part of the graph am I looking for? • WHERE • triple patterns • graph patterns

9. SPARQL in a Nutshell What do I want to get back? • SELECT: list of things • DESCRIBE: RDF graph for one 0 Prologue resource • CONSTRUCT: custom RDF graph 1 query clause • ASK: boolean value (true or false) 2 WHERE clause Which part of the graph am I looking for? • WHERE • triple patterns • graph patterns

10. SPARQL in a Nutshell What do I want to get back? • SELECT: list of things • DESCRIBE: RDF graph for one 0 Prologue resource • CONSTRUCT: custom RDF graph 1 query clause • ASK: boolean value (true or false) 2 WHERE clause Which part of the graph am I looking for? • WHERE 3 Modiﬁers • triple patterns • graph patterns

14. PREFIX mo: <http://purl.org/ontology/mo/> PREFIX dce: <http://purl.org/dc/elements/1.1/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?album ?title ?release_date WHERE { ! ?album a mo:Record ; graph pattern ! ! dce:date ?release_date ; ! ! dce:title ?title . ! FILTER (year(?release_date) = 2007 && month(?release_date) = 7) } ORDER BY ?release_date

17. Example Data • from music site Jamendo: http://ww.jamendo.com • linked data at DBTune: http://dbtune.org/jamendo/ • thousands of artists with albums, tracks, etc. • additionally, some geographical data from Geonames: http://www.geonames.org/

19. http:// http:// http:// Whiteshoulders www.petithomme.org Petit Homme img.jamendo.com/ blackshoulders.hautetfort.com/ artists/w/whiteshoulders.jpg foaf:name foaf:homepage foaf:name foaf:homepage mo:MusicArtist foaf:img a a artists:3908 records:4092 foaf:made artists:3732 foaf:based_near foaf:made foaf:made foaf:made foaf:based_near locations:3019599/ foaf:img records:6361 records:4295 foaf:made records:3604 foaf:made records:3738 mo:Record http:// foaf:maker W (EP) img.jamendo.com/ artists/p/ a dce:title petit.homme.gif hg:taggedWithTag records:8836 dce:date 2007-10-09T15:58:17 tags:noisy hg:taggedWithTag mo:track tags:electro mo:track hg:taggedWithTag tracks:90508 mo:track mo:track hg:taggedWithTag tracks:90496 tags:experimental tracks:90504 tracks:90510 tags:noise

20. @base <http://dbtune.org/jamendo/> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix mo: <http://purl.org/ontology/mo/> . @prefix dce: <http://purl.org/dc/elements/1.1/> . @prefix hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> . @prefix tags: <tag/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . <artist/3908> a mo:MusicArtist ; foaf:based_near <http://sws.geonames.org/3019599/> ; foaf:homepage <http://www.petithomme.org> ; foaf:img <http://img.jamendo.com/artists/p/petit.homme.gif> ; foaf:made <record/3604>, <record/4295> ; foaf:name "Petit Homme"^^xsd:string . <artist/3732> Text a mo:MusicArtist ; foaf:based_near <http://sws.geonames.org/3019599/> ; foaf:homepage <http://blackshoulders.hautetfort.com/> ; foaf:img <http://img.jamendo.com/artists/w/white-shoulders.jpg> ; foaf:made <record/3738>, <record/4092>, <record/6361>, <record/8836> ; foaf:name "Whiteshoulders"^^xsd:string . <record/8836> dce:date "2007-10-09T15:58:17"^^xsd:dateTime ; dce:title "W (EP)"^^xsd:string ; mo:track <track/90496>, <track/90504>, <track/90508>, <track/90510> ; hg:taggedWithTag tags:electro, tags:experimental, tags:noise, tags:noisy ; a mo:Record ; foaf:maker <artist/3732> .

21. <artist/3908> a mo:MusicArtist . <artist/3908> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3908> foaf:homepage <http://www.petithomme.org> . <artist/3908> foaf:img <http://img.jamendo.com/artists/p/petit.homme.gif> . <artist/3908> foaf:made <record/3604> . <artist/3908> foaf:made <record/4295> . <artist/3908> foaf:name "Petit Homme"^^xsd:string . <artist/3732> a mo:MusicArtist . <artist/3732> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3732> foaf:homepage <http://blackshoulders.hautetfort.com/> . <artist/3732> foaf:img <http://img.jamendo.com/artists/w/white-shoulders.jpg> . <artist/3732> foaf:made <record/3738> . <artist/3732> foaf:made <record/4092> . <artist/3732> <artist/3732> Text foaf:made <record/6361> . foaf:made <record/8836> . <artist/3732> foaf:name "Whiteshoulders"^^xsd:string . <record/8836> dce:date "2007-10-09T15:58:17"^^xsd:dateTime . <record/8836> dce:title "W (EP)"^^xsd:string . <record/8836> mo:track <track/90496> . <record/8836> mo:track <track/90504> . <record/8836> mo:track <track/90508> . <record/8836> mo:track <track/90510> . <record/8836> hg:taggedWithTag tags:electro . <record/8836> hg:taggedWithTag tags:experimental . <record/8836> hg:taggedWithTag tags:noise . <record/8836> hg:taggedWithTag tags:noisy . <record/8836> a mo:Record . <record/8836> foaf:maker <artist/3732> .

22. Triple and Graph Patterns

23. WHERE { ! ?album a mo:Record ; ! ! dce:date ?release_date ; ! ! dce:title ?title . ! FILTER (year(?release_date) = 2007 && month(?release_date) = 7) }

24. no variables

25. <artist/3908> a mo:MusicArtist . <artist/3908> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3908> foaf:homepage <http://www.petithomme.org> . <artist/3908> foaf:img <http://img.jamendo.com/artists/p/petit.homme.gif> . <artist/3908> foaf:made <record/3604> . <artist/3908> foaf:made <record/4295> . <artist/3908> foaf:name "Petit Homme"^^xsd:string . <artist/3732> a mo:MusicArtist . <artist/3732> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3732> foaf:homepage <http://blackshoulders.hautetfort.com/> . <artist/3732> foaf:img <http://img.jamendo.com/artists/w/white-shoulders.jpg> . <artist/3732> foaf:made <record/3738> . <artist/3732> <artist/3732> Text foaf:made <record/4092> . foaf:made <record/6361> . <artist/3732> foaf:made <record/8836> . <artist/3732> foaf:name "Whiteshoulders"^^xsd:string . <record/8836> dce:date "2007-10-09T15:58:17"^^xsd:dateTime . <record/8836> dce:title "W (EP)"^^xsd:string . <record/8836> mo:track <track/90496> . <record/8836> mo:track <track/90504> . <record/8836> mo:track <track/90508> . <record/8836> mo:track <track/90510> . <record/8836> hg:taggedWithTag tags:electro . <record/8836> hg:taggedWithTag tags:experimental . <record/8836> hg:taggedWithTag tags:noise . <record/8836> hg:taggedWithTag tags:noisy . <record/8836> a mo:Record . <record/8836> foaf:maker <artist/3732> .

28. one variable

35. two variables

44. three variables ?subject ?predicate ?object

45. <artist/3908> a mo:MusicArtist . <artist/3908> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3908> foaf:homepage <http://www.petithomme.org> . <artist/3908> foaf:img <http://img.jamendo.com/artists/p/petit.homme.gif> . <artist/3908> foaf:made <record/3604> . <artist/3908> foaf:made <record/4295> . <artist/3908> foaf:name "Petit Homme"^^xsd:string . <artist/3732> a mo:MusicArtist . <artist/3732> foaf:based_near <http://sws.geonames.org/3019599/> . <artist/3732> foaf:homepage <http://blackshoulders.hautetfort.com/> . <artist/3732> foaf:img <http://img.jamendo.com/artists/w/white-shoulders.jpg> . <artist/3732> foaf:made <record/3738> . <artist/3732> foaf:made <record/4092> . <artist/3732> foaf:made <record/6361> . <artist/3732> foaf:made <record/8836> . <artist/3732> foaf:name "Whiteshoulders"^^xsd:string . <record/8836> dce:date "2007-10-09T15:58:17"^^xsd:dateTime . <record/8836> dce:title "W (EP)"^^xsd:string . <record/8836> mo:track <track/90496> . <record/8836> mo:track <track/90504> . <record/8836> mo:track <track/90508> . <record/8836> mo:track <track/90510> . <record/8836> hg:taggedWithTag tags:electro . <record/8836> hg:taggedWithTag tags:experimental . <record/8836> hg:taggedWithTag tags:noise . <record/8836> hg:taggedWithTag tags:noisy . <record/8836> a mo:Record . <record/8836> foaf:maker <artist/3732> .

47. graph pattern ?artist a mo:MusicArtist ; ! ! foaf:name ?artist_name ; ! ! foaf:homepage ?homepage .

51. Interfaces to SPARQL endpoints • Web interfaces • Bindings for programming languages • straight HTTP • command line interfaces

52. http://data.semanticweb.org/snorql

53. http://factforge.net/sparql

54. http://kasabi.com/dataset/world-geography

55. ARQ we will use the arq command line tool - see the ARQ Command Line Cheat Sheet: arq --data data/jamendo.nt --query queries/query5.rq

56. Example Scenario • Get all albums for a particular month (e.g., July 2007) • List all Jamendo artists in France • explore datasets and build ﬁnal query bit by bit • learn about different features of SPARQL along the way • cannot cover every aspect of SPARQL! E.g., property paths are missing.

57. List all Classes SELECT DISTINCT ?class WHERE { ! ?s a ?class . } ﬁnd all types of things in the dataset (classes)

58. List all Classes SELECT DISTINCT ?class WHERE { ! ?s a ?class . } ﬁnd all types of things in the dataset (classes) -------------------------------------------------------- | class | ======================================================== | <http://purl.org/ontology/mo/Playlist> | | <http://purl.org/ontology/mo/Signal> | | <http://purl.org/ontology/mo/Lyrics> | | <http://purl.org/ontology/mo/Track> | | <http://www.w3.org/2006/time#Interval> | | <http://purl.org/ontology/mo/Torrent> | | <http://purl.org/ontology/mo/ED2K> | | <http://purl.org/ontology/mo/Record> | | <http://www.holygoat.co.uk/owl/redwood/0.1/tags/Tag> | | <http://purl.org/ontology/mo/MusicArtist> | | <http://xmlns.com/foaf/0.1/Document> | --------------------------------------------------------

59. List all Classes SELECT DISTINCT ?class WHERE { ! ?s a ?class . } ﬁnd all types of things in the dataset (classes) -------------------------------------------------------- | class | ======================================================== | <http://purl.org/ontology/mo/Playlist> | | <http://purl.org/ontology/mo/Signal> | | <http://purl.org/ontology/mo/Lyrics> | | <http://purl.org/ontology/mo/Track> | | <http://www.w3.org/2006/time#Interval> | | <http://purl.org/ontology/mo/Torrent> | | <http://purl.org/ontology/mo/ED2K> | | <http://purl.org/ontology/mo/Record> | | <http://www.holygoat.co.uk/owl/redwood/0.1/tags/Tag> | | <http://purl.org/ontology/mo/MusicArtist> | | <http://xmlns.com/foaf/0.1/Document> | --------------------------------------------------------

60. Properties of Artists PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?pred WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . } all properties for the mo:MusicArtist class

61. Properties of Artists PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?pred WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . } all properties for the mo:MusicArtist class ----------------------------------------------------- | pred | ===================================================== | <http://xmlns.com/foaf/0.1/name> | | <http://xmlns.com/foaf/0.1/made> | | <http://xmlns.com/foaf/0.1/img> | | <http://xmlns.com/foaf/0.1/based_near> | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | <http://xmlns.com/foaf/0.1/homepage> | | mo:biography | -----------------------------------------------------

62. Properties of Artists, ctd. PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?class WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . ! ?obj a ?class ; } properties with objects

63. Properties of Artists, ctd. PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?class WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . ! ?obj a ?class ; } properties with objects ------------------------------------------------ | pred | class | ================================================ | <http://xmlns.com/foaf/0.1/made> | mo:Record | ------------------------------------------------ only one result?

64. Properties of Artists, ctd. PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?class WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } OPTIONAL statement }

65. Properties of Artists, ctd. PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?class WHERE { ! ?artist a mo:MusicArtist ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } OPTIONAL statement } ----------------------------------------------------------------- | pred | class | ================================================================= | <http://xmlns.com/foaf/0.1/name> | | | <http://xmlns.com/foaf/0.1/made> | mo:Record | | <http://xmlns.com/foaf/0.1/img> | | | <http://xmlns.com/foaf/0.1/based_near> | | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | | <http://xmlns.com/foaf/0.1/homepage> | | | mo:biography | | -----------------------------------------------------------------

66. Properties of Records PREFIX mo: <http://purl.org/ontology/mo/> PREFIX hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dce: <http://purl.org/dc/elements/1.1/> SELECT DISTINCT ?pred ?class WHERE { ! ?record a mo:Record ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } }

67. Properties of Records PREFIX mo: <http://purl.org/ontology/mo/> PREFIX hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dce: <http://purl.org/dc/elements/1.1/> SELECT DISTINCT ?pred ?class WHERE { ! ?record a mo:Record ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } } ---------------------------------------------------------------------- | pred | class | ====================================================================== | foaf:maker | mo:MusicArtist | | mo:track | mo:Track | | hg:taggedWithTag | hg:Tag | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | | mo:available_as | mo:ED2K | | mo:image | | | dce:date | | | mo:available_as | mo:Torrent | | dce:title | | | mo:available_as | mo:Playlist | | dce:description | | ----------------------------------------------------------------------

68. Properties of Records PREFIX mo: <http://purl.org/ontology/mo/> PREFIX hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dce: <http://purl.org/dc/elements/1.1/> SELECT DISTINCT ?pred ?class WHERE { ! ?record a mo:Record ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } } ---------------------------------------------------------------------- | pred | class | ====================================================================== | foaf:maker | mo:MusicArtist | | mo:track | mo:Track | | hg:taggedWithTag | hg:Tag | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | | mo:available_as | mo:ED2K | | mo:image | | | dce:date | | | mo:available_as | mo:Torrent | | dce:title | | | mo:available_as | mo:Playlist | | dce:description | | ----------------------------------------------------------------------

69. Properties of Records, ctd. PREFIX mo: <http://purl.org/ontology/mo/> PREFIX hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dce: <http://purl.org/dc/elements/1.1/> SELECT DISTINCT ?pred ?class WHERE { ! ?record a mo:Record ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } } ORDER BY ASC(?pred) DESC(?class) ORDER BY statement

70. Properties of Records, ctd. PREFIX mo: <http://purl.org/ontology/mo/> PREFIX hg: <http://www.holygoat.co.uk/owl/redwood/0.1/tags/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dce: <http://purl.org/dc/elements/1.1/> SELECT DISTINCT ?pred ?class WHERE { ! ?record a mo:Record ; ! ! ?pred ?obj . ! OPTIONAL { ! ! ?obj a ?class . ! } } ORDER BY ASC(?pred) DESC(?class) ORDER BY statement ---------------------------------------------------------------------- | pred | class | ====================================================================== | dce:date | | | dce:description | | | dce:title | | | mo:available_as | mo:Torrent | | mo:available_as | mo:Playlist | | mo:available_as | mo:ED2K | | mo:image | | | mo:track | mo:Track | | hg:taggedWithTag | hg:Tag | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | | foaf:maker | mo:MusicArtist | ----------------------------------------------------------------------

73. Problem: Wrong data format • date/time related functions in SPARQL expect dates in xsd:dateTime format: "2007-06-15T17:13:58"^^xsd:dateTime • however, source data has dates as plain literals with wrong format: "2007-06-15 17:13:58"

74. Fixing Data PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dce: <http://purl.org/dc/elements/1.1/> CONSTRUCT { ! ?s2 dce:date ?date_fixed . } WHERE { ! ?s2 dce:date ?date . ! BIND (STRDT(REPLACE(?date, " ", "T"), xsd:dateTime) AS ?date_fixed) }

79. Fixing Data PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dce: <http://purl.org/dc/elements/1.1/> CONSTRUCT { ! ?s2 dce:date ?date_fixed . } WHERE { ! ?s2 dce:date ?date . ! BIND (STRDT(REPLACE(?date, " ", "T"), xsd:dateTime) AS ?date_fixed) } @prefix dce: <http://purl.org/dc/elements/1.1/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . <http://dbtune.org/jamendo/record/6015> dce:date "2007-06-15T17:13:58"^^xsd:dateTime . <http://dbtune.org/jamendo/record/6343> dce:date "2007-07-05T19:32:23"^^xsd:dateTime . <http://dbtune.org/jamendo/record/12863> dce:date "2007-11-19T11:46:34"^^xsd:dateTime . <http://dbtune.org/jamendo/record/3993> dce:date "2007-02-01T18:08:28"^^xsd:dateTime .

80. Filtering Results PREFIX dce: <http://purl.org/dc/elements/1.1/> CONSTRUCT { ! ?s ?p ?o . } WHERE { ! ?s ?p ?o . ! FILTER (?p != dce:date) }

81. All albums for 2007/07 PREFIX mo: <http://purl.org/ontology/mo/> PREFIX dce: <http://purl.org/dc/elements/1.1/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?album ?title ?release_date WHERE { ! ?album a mo:Record ; ! ! dce:date ?release_date ; ! ! dce:title ?title . ! FILTER (YEAR(?release_date) = 2007 && MONTH(?release_date) = 7) } ORDER BY ?release_date

82. All albums for 2007/07 PREFIX mo: <http://purl.org/ontology/mo/> PREFIX dce: <http://purl.org/dc/elements/1.1/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?album ?title ?release_date WHERE { ! ?album a mo:Record ; ! ! dce:date ?release_date ; ! ! dce:title ?title . ! FILTER (YEAR(?release_date) = 2007 && MONTH(?release_date) = 7) } ORDER BY ?release_date -------------------------------------------------------------------------------------------------------------------------- | album | title | release_date | ========================================================================================================================== | <http://dbtune.org/jamendo/record/6310> | "Demo 2005"^^xsd:string | "2007-07-04T16:24:23"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6320> | "Cinema"^^xsd:string | "2007-07-04T16:39:11"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6312> | "ECLECTEK II"^^xsd:string | "2007-07-04T17:02:09"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6302> | "Unknow user"^^xsd:string | "2007-07-04T18:06:18"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6323> | "girls always cry-xysides"^^xsd:string | "2007-07-04T23:16:26"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6327> | "Fest-noz is dead"^^xsd:string | "2007-07-05T11:29:03"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6328> | "Félin Pour L'Autre"^^xsd:string | "2007-07-05T13:04:37"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6250> | "BLAPP."^^xsd:string | "2007-07-05T14:18:11"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6332> | "Cà Phê and Pizza"^^xsd:string | "2007-07-05T16:04:02"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6329> | "Life in Lento Violento"^^xsd:string | "2007-07-05T16:39:17"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6336> | "Transition"^^xsd:string | "2007-07-05T16:47:49"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6338> | "Die Zahl der Toten"^^xsd:string | "2007-07-05T19:20:52"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6343> | "Offender Girl"^^xsd:string | "2007-07-05T19:32:23"^^xsd:dateTime | | <http://dbtune.org/jamendo/record/6377> | "Donne moi"^^xsd:string | "2007-07-10T17:29:23"^^xsd:dateTime |

83. SPARQL Federated Queries

84. Artists in France PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?location WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?location . }

85. Artists in France PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?location WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?location . }

86. Artists in France PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX mo: <http://purl.org/ontology/mo/> SELECT DISTINCT ?location WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?location . } -------------------------------------- | location | ====================================== | <http://sws.geonames.org/2661602/> | | <http://sws.geonames.org/2997861/> | | <http://sws.geonames.org/3013767/> | | <http://sws.geonames.org/3013726/> | | <http://sws.geonames.org/2802361/> | | <http://sws.geonames.org/3026644/> | | <http://sws.geonames.org/3017382/> | | <http://sws.geonames.org/3865483/> | | <http://sws.geonames.org/2968815/> | | <http://sws.geonames.org/3013657/> | | <http://sws.geonames.org/2987410/> | | <http://sws.geonames.org/2750405/> | | <http://sws.geonames.org/6424360/> | | <http://sws.geonames.org/6556330/> | | <http://sws.geonames.org/3213264/> | | <http://sws.geonames.org/2967196/> |

87. Geonames SPARQL endpoints • http://api.kasabi.com/dataset/geonames/apis/ sparql • http://factforge.net/sparql

88. Querying Remote Endpoint SELECT DISTINCT ?pred WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! <http://sws.geonames.org/2661602/> ?pred ?obj . ! } }

89. Querying Remote Endpoint SELECT DISTINCT ?pred WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! <http://sws.geonames.org/2661602/> ?pred ?obj . ! } }

90. Querying Remote Endpoint SELECT DISTINCT ?pred WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! <http://sws.geonames.org/2661602/> ?pred ?obj . ! } } ------------------------------------------------------- | pred | ======================================================= | <http://www.geonames.org/ontology#alternateName> | | <http://www.geonames.org/ontology#countryCode> | | <http://www.geonames.org/ontology#featureClass> | | <http://www.geonames.org/ontology#featureCode> | | <http://www.geonames.org/ontology#locationMap> | | <http://www.geonames.org/ontology#name> | | <http://www.geonames.org/ontology#parentADM1> | | <http://www.geonames.org/ontology#parentCountry> | | <http://www.geonames.org/ontology#parentFeature> | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | <http://www.w3.org/2000/01/rdf-schema#isDefinedBy> | | <http://www.w3.org/2003/01/geo/wgs84_pos#lat> | | <http://www.w3.org/2003/01/geo/wgs84_pos#long> | | <http://www.geonames.org/ontology#childrenFeatures> | -------------------------------------------------------

93. Combining Local + Remote PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?location . ! ! ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! ?location geonames:name ?name . ! } ! ! } LIMIT 50

94. Combining Local + Remote PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?location . ! ! ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! ?location geonames:name ?name . ! } ! ! } LIMIT 50 ------------------------------------------------------------------------------------- | artist | name | ===================================================================================== | <http://dbtune.org/jamendo/artist/5496> | "Kanton Basel-Stadt" | | <http://dbtune.org/jamendo/artist/256> | "Département de la Loire-Atlantique" | | <http://dbtune.org/jamendo/artist/337049> | "Département de la Haute-Garonne" | | <http://dbtune.org/jamendo/artist/8035> | "Département des Hautes-Pyrénées" | | <http://dbtune.org/jamendo/artist/6260> | "Kingdom of Belgium" | | <http://dbtune.org/jamendo/artist/2471> | "Département de la Charente-Maritime" | | <http://dbtune.org/jamendo/artist/3572> | "Republic of France" | | <http://dbtune.org/jamendo/artist/4680> | "Argentine Republic" |

95. What is France? PREFIX geonames: <http://www.geonames.org/ontology#> SELECT DISTINCT ?country ?name WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! SELECT DISTINCT ?country ?name ! ! WHERE { ! ! ! ?country geonames:featureCode geonames:A.PCLI ; ! ! ! ! geonames:name ?name . ! ! ! FILTER (regex(?name, "france", "i")) ! ! } ! } } ORDER BY ?name

96. What is France? PREFIX geonames: <http://www.geonames.org/ontology#> SELECT DISTINCT ?country ?name WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql? apikey=07d5e23c8d7bf5ae576f39c64e822ea6baffea98> ! { ! ! SELECT DISTINCT ?country ?name ! ! WHERE { ! ! ! ?country geonames:featureCode geonames:A.PCLI ; ! ! ! ! geonames:name ?name . ! ! ! FILTER (regex(?name, "france", "i")) ! ! } ! } } ORDER BY ?name ------------------------------------------------------------- | country | name | ============================================================= | <http://sws.geonames.org/3017382/> | "Republic of France" | -------------------------------------------------------------

97. Artists in France (1) PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near <http://sws.geonames.org/3017382/> ; ! ! foaf:name ?name . ! ! } ORDER BY ?name

98. Artists in France (1) PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near <http://sws.geonames.org/3017382/> ; ! ! foaf:name ?name . ! ! } ORDER BY ?name ------------------------------------------------------------------------------------------------------------------- | artist | name | =================================================================================================================== | <http://dbtune.org/jamendo/artist/3972> | "#2 Orchestra"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/5865> | "(own+line)"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/4779> | "7BZH"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/3297> | "AMarie.C"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/754> | "Adam Lwo"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/4825> | "Alteranti"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/784> | "Ataraxia Rebel Force"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/289> | "Auto/Sexual"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/565> | "BUREAU DES FLUIDES"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/336803> | "Baron Baroff"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/8316> | "Bertrand Homassel"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/274> | "Bleacher"^^<http://www.w3.org/2001/XMLSchema#string> | | <http://dbtune.org/jamendo/artist/3835> | "Brigade Neurale"^^<http://www.w3.org/2001/XMLSchema#string> |

99. Artists in France (2) PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name ?place ?place_name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?name . ! ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql?apikey=APIKEY> ! { ! ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! ! geonames:name ?place_name . ! } ! ! } ORDER BY ?name LIMIT 10

100. Artists in France (2) PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist ?name ?place ?place_name WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?name . ! ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql?apikey=APIKEY> ! { ! ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! ! geonames:name ?place_name . ! } ! ! } ORDER BY ?name LIMIT 10

101. Places in France PREFIX geonames: ! <http://www.geonames.org/ontology#> CONSTRUCT { ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! geonames:name ?name . } WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql?apikey=APIKEY> ! { ! ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! ! geonames:name ?name . ! }! ! }

102. Places in France PREFIX geonames: ! <http://www.geonames.org/ontology#> CONSTRUCT { ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! geonames:name ?name . } WHERE { ! SERVICE <http://api.kasabi.com/dataset/geonames/apis/sparql?apikey=APIKEY> ! { ! ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! ! geonames:name ?name . ! }! ! } @prefix geonames: <http://www.geonames.org/ontology#> . <http://sws.geonames.org/3003977/> geonames:name "Le Grand Merimont" ; geonames:parentCountry <http://sws.geonames.org/3017382/> . <http://sws.geonames.org/2994812/> geonames:name "Mean-Ruz" ; geonames:parentCountry <http://sws.geonames.org/3017382/> . <http://sws.geonames.org/7535264/> geonames:name "Golf du Prieuré" ; geonames:parentCountry <http://sws.geonames.org/3017382/> .

103. Et voilà - Les artistes de France! PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist_name ?place_name FROM <../data/jamendo-rdf/jamendo.nt> FROM <../data/in_france.nt> WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?artist_name . ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! geonames:name ?place_name . } ORDER BY ?artist_name

104. Et voilà - Les artistes de France! PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist_name ?place_name FROM <../data/jamendo-rdf/jamendo.nt> FROM <../data/in_france.nt> WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?artist_name . ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! geonames:name ?place_name . } ORDER BY ?artist_name ---------------------------------------------------------------------------------------------------------------- | artist_name | place_name | ================================================================================================================ | "#2 Orchestra"^^<http://www.w3.org/2001/XMLSchema#string> | "Republic of France" | | "#Blockout"^^<http://www.w3.org/2001/XMLSchema#string> | "Département des Yvelines" | | "#Dance 75#"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "#NarNaoud#"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de la Gironde" | | "#ZedMeta#"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "#Zorglups#"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de l'Essonne" | | "&ND"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "(own+line)"^^<http://www.w3.org/2001/XMLSchema#string> | "Republic of France" | | "* Q u i r y *"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "-=Kwada=-"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de la Haute-Garonne" | | "-DEMO-"^^<http://www.w3.org/2001/XMLSchema#string> | "Département du Nord" |

105. Et voilà - Les artistes de France! PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist_name ?place_name FROM <../data/jamendo-rdf/jamendo.nt> FROM <../data/in_france.nt> WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?artist_name . ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! geonames:name ?place_name . } ORDER BY ?artist_name ---------------------------------------------------------------------------------------------------------------- | artist_name | place_name | ================================================================================================================ | "#2 Orchestra"^^<http://www.w3.org/2001/XMLSchema#string> | "Republic of France" | | "#Blockout"^^<http://www.w3.org/2001/XMLSchema#string> | "Département des Yvelines" | | "#Dance 75#"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "#NarNaoud#"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de la Gironde" | | "#ZedMeta#"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "#Zorglups#"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de l'Essonne" | | "&ND"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "(own+line)"^^<http://www.w3.org/2001/XMLSchema#string> | "Republic of France" | | "* Q u i r y *"^^<http://www.w3.org/2001/XMLSchema#string> | "Paris" | | "-=Kwada=-"^^<http://www.w3.org/2001/XMLSchema#string> | "Département de la Haute-Garonne" | | "-DEMO-"^^<http://www.w3.org/2001/XMLSchema#string> | "Département du Nord" |

106. One more thing... PREFIX foaf: ! ! <http://xmlns.com/foaf/0.1/> PREFIX geonames: ! <http://www.geonames.org/ontology#> PREFIX mo: ! ! <http://purl.org/ontology/mo/> SELECT DISTINCT ?artist_name ?place_name FROM <../data/jamendo-rdf/jamendo.nt> FROM NAMED <../data/in_france.nt> WHERE { ! ?artist a mo:MusicArtist ; ! ! foaf:based_near ?place ; ! ! foaf:name ?artist_name . ! GRAPH <../data/in_france.nt> { ! ! ?place geonames:parentCountry <http://sws.geonames.org/3017382/> ; ! ! ! geonames:name ?place_name . ! } } ORDER BY ?artist_name

111. One last thing... PREFIX swrc: <http://swrc.ontoware.org/ontology#> PREFIX org: <http://data.semanticweb.org/organization/> SELECT ?affiliation ?conference_graph WHERE { ! SERVICE <http://data.semanticweb.org/sparql> { ! ! GRAPH ?conference_graph { ! ! ! <http://data.semanticweb.org/person/richard-cyganiak> swrc:affiliation ?affiliation . ! ! } ! } }

112. One last thing... PREFIX swrc: <http://swrc.ontoware.org/ontology#> PREFIX org: <http://data.semanticweb.org/organization/> SELECT ?affiliation ?conference_graph WHERE { ! SERVICE <http://data.semanticweb.org/sparql> { ! ! GRAPH ?conference_graph { ! ! ! <http://data.semanticweb.org/person/richard-cyganiak> swrc:affiliation ?affiliation . ! ! } ! } }

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